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公开(公告)号：US20220123626A1
公开(公告)日：2022-04-21
申请号：US17564624
申请日：2021-12-29
Applicant: Harbin Engineering University
Inventor： Long Liu , Yuanheng Tang , Chen An , Xiao Han , Junjie Liu , Qihao Mei , Hao Zhao , Zhichun Xu
Abstract: Provided is a free piston generator based on a split thermodynamic cycle, which belongs to the technical field of power energy. The present disclosure solves the problem of low power generation efficiency of an existing free piston generator. The free piston generator includes a linear generator set and two internal combustion engine sets arranged at two ends of the linear generator set. Air is first subjected to first-stage compression by the low-pressure cylinder set in the internal combustion engine sets and is then subjected to second-stage compression in the high-pressure cylinders, so that the intake pressure of an internal combustion engine is effectively increased, which is favorable for increasing the average effective pressure in a work process, thereby improving the thermal efficiency and the power generation efficiency of the free piston generator. A combusted working medium is first subjected to first-stage expansion in the high-pressure cylinders and is then subjected to second-stage expansion in the low-pressure cylinders, which effectively increases the utilization rate of energy in exhaust gas, increases the expansion work, and further improves the thermal efficiency and the power generation efficiency of the free piston generator.
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公开(公告)号：US20220120250A1
公开(公告)日：2022-04-21
申请号：US17564589
申请日：2021-12-29
Applicant: Harbin Engineering University
Inventor： Long Liu , Shihai Liu , Dai Liu , Jian Zhang , Yue Wu , Chen An , Qihao Mei , Wang Yang
Abstract: The present disclosure provides an apparatus for testing spray and combustion performance of an internal-combustion engine based on a rapid compression-expansion machine, which belongs to the testing field of internal-combustion engines. The present disclosure solves the problems that the existing test of the internal-combustion engine testing apparatus having a complex structure, is poor in adaptability, cannot be observed easily, and cannot meet the requirements of multi-fuel injection and multi-injection-pressure tests. It includes a driving mechanism, a transmission mechanism, an engine cylinder, an air intake system and an exhaust system. The engine cylinder includes a piston, a cylinder block, a dual-fuel cylinder head and a multi-injector assembly. The piston is disposed in the cylinder block. The driving mechanism is connected with the piston through the transmission mechanism and drives the piston to linearly move back and forth along a vertical direction of the cylinder block. The dual-fuel cylinder head is connected to an upper part of the cylinder block. The multi-fuel injection assembly includes a plurality of injectors. The plurality of injectors are of the same type and are all disposed on the dual-fuel cylinder head. The upper part of the cylinder block is transversely provided with an air intake and an exhaust port, and the air intake and the exhaust port are perpendicular to a moving direction of the piston. It is mainly used for testing the combustion performance.
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3.发明授权公开(公告)号：US11959826B2
公开(公告)日：2024-04-16
申请号：US17564558
申请日：2021-12-29
Applicant: Harbin Engineering University
Inventor： Long Liu , Yue Wu , Dai Liu , Qian Xiong , Xinru Shi , Shihai Liu , Chen An , Qihao Mei
Abstract: The disclosure is an engine simulation test device capable of realizing an ultrahigh compression temperature and pressure, belonging to the field of a diesel engine high-temperature and high-pressure system, solving the problems that the existing engine simulation test cannot achieve ultra-high compression temperature and pressure, and the temperature and pressure are not adjustable. It includes a compressed air inlet mechanism, a nitrogen gas inlet mechanism, a pressure stabilizing mechanism, a cyclic heating mechanism, an air inlet mechanism and a fast compressor mechanism. The compressed air inlet mechanism and the nitrogen gas inlet mechanism are both connected with a gas inlet end of a pressure stabilizing tank in the pressure stabilizing mechanism, the compressed air inlet mechanism and the nitrogen gas inlet mechanism respectively introduce air and nitrogen gas into the pressure stabilizing tank, the pressure stabilizing tank is connected with the cyclic heating mechanism, the cyclic heating mechanism heats gas in the pressure stabilizing tank, a gas outlet end of the pressure stabilizing tank is connected with the fast compressor mechanism, and the air inlet mechanism is connected between the pressure stabilizing tank and the fast compressor mechanism. The device is mainly used for an engine simulation test.
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公开(公告)号：US20220123627A1
公开(公告)日：2022-04-21
申请号：US17564656
申请日：2021-12-29
Applicant: Harbin Engineering University
Inventor： Long Liu , Qihao Mei , Hao Zhao , Zhichun Xu , Yuanheng Tang , Chen An , Xiao Han , Junjie Liu
Abstract: A free piston generator based on a rigid synchronous transmission system is provided, which belongs to the technical field of power energy. The present disclosure solves the problems of low power generation efficiency and low stability of the existing free piston generator. The free piston generator based on the rigid synchronous transmission system includes a first linear generator set, a second linear generator set, a rigid synchronous transmission assembly, two high-pressure cylinders arranged at two ends of the first linear generator set, and two low-pressure cylinders arranged at two ends of the second linear generator set. The combustion product is firstly subjected to first-stage expansion in the high-pressure cylinder and is then subjected to second-stage expansion in the low-pressure cylinder, which effectively increases the energy utilization in exhaust gas, also increases the expansion work, and further improves the thermal efficiency and the power generation efficiency of the free piston generator. By means of the rigid synchronous transmission assembly, high-pressure pistons and low-pressure pistons are always kept in stable phase operation, so as to avoid the problems of wall-impingement and insufficient pressure of compressed air due to the phase mismatching.
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公开(公告)号：US20220120214A1
公开(公告)日：2022-04-21
申请号：US17565531
申请日：2021-12-30
Applicant: Harbin Engineering University
Inventor： Long Liu , Chen An , Zhichun Xu , Yuanheng Tang , Hao Zhao , Xiao Han , Junjie Liu , Qihao Mei
Abstract: The present disclosure provides a six-cylinder opposed free piston internal combustion engine generator. The generator comprises two free piston internal combustion engine sets, one opposed piston internal combustion engine set and two linear generator sets. Air entering cylinders is subjected to first-stage compression in low-pressure cylinder sets in the free piston internal combustion engine sets and the opposed piston internal combustion engine set and then subjected to second-stage compression in high-pressure cylinder sets, and a high pressure gas produced after the combustion is subjected to first-stage expansion in the high-pressure cylinder sets and then subjected to second-stage expansion in the low-pressure cylinder sets. The technical problem about how to improve the power generation efficiency of the opposed free piston generator and improve the reliability of the device is solved, the six-cylinder opposed free piston internal combustion engine generator is provided, a dual piston dual cylinder type free-piston internal combustion engine linear generator is used for replacing a return device in the opposed free piston generator, and the reliability and the power generation efficiency of the device are improved.
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Patent Agency Ranking
公开(公告)号：US12209549B2
公开(公告)日：2025-01-28
申请号：US18085628
申请日：2022-12-21
Applicant: Harbin Engineering University
Inventor： Long Liu , Yan Peng , Changfu Han , Haicheng Qi , Li Huang , Wenzheng Zhang
IPC: F02D41/24 , F02D41/26 , G06F30/17 , G06F111/10
Abstract: Disclosed is a combustion system design method based on a target heat release rate, which belongs to the technical field of diesel engine combustion chamber design. The method includes: obtaining an ideal heat release rate based on Sabathe-Miller cycle; simulating the ideal heat release rate based on a double-Wiebe function and obtaining the target heat release rate; constructing a mapping relation among the heat release rate, piston geometric parameters and fuel injection parameters, which includes target start of combustion being an function of fuel injection timing and ignition delay, premixed combustion parameters being functions of throat radius, injection pressure and nozzle diameter, and diffusion combustion being a function of piston pit depth; solving target piston geometric parameters and target fuel injection parameters based on the mapping relation; and then designing a combustion system. The method does not depend on experience and multi-scheme design, greatly shortens the combustion system design.
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公开(公告)号：US11831225B2
公开(公告)日：2023-11-28
申请号：US17564656
申请日：2021-12-29
Applicant: Harbin Engineering University
Inventor： Long Liu , Qihao Mei , Hao Zhao , Zhichun Xu , Yuanheng Tang , Chen An , Xiao Han , Junjie Liu
CPC classification number: H02K7/1869 , F01B7/02 , F02B71/00 , H02K5/04 , H02K7/10 , H02K7/1166 , H02K7/1884
Abstract: A free piston generator based on a rigid synchronous transmission system is provided, which belongs to the technical field of power energy. The present disclosure solves the problems of low power generation efficiency and low stability of the existing free piston generator. The free piston generator based on the rigid synchronous transmission system includes a first linear generator set, a second linear generator set, a rigid synchronous transmission assembly, two high-pressure cylinders arranged at two ends of the first linear generator set, and two low-pressure cylinders arranged at two ends of the second linear generator set. The combustion product is firstly subjected to first-stage expansion in the high-pressure cylinder and is then subjected to second-stage expansion in the low-pressure cylinder, which effectively increases the energy utilization in exhaust gas, also increases the expansion work, and further improves the thermal efficiency and the power generation efficiency of the free piston generator. By means of the rigid synchronous transmission assembly, high-pressure pistons and low-pressure pistons are always kept in stable phase operation, so as to avoid the problems of wall-impingement and insufficient pressure of compressed air due to the phase mismatching.
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公开(公告)号：US11454203B2
公开(公告)日：2022-09-27
申请号：US17564589
申请日：2021-12-29
Applicant: Harbin Engineering University
Inventor： Long Liu , Shihai Liu , Dai Liu , Jian Zhang , Yue Wu , Chen An , Qihao Mei , Wang Yang
Abstract: The present disclosure provides an apparatus for testing spray and combustion performance of an internal-combustion engine based on a rapid compression-expansion machine, which belongs to the testing field of internal-combustion engines. It includes a driving mechanism, a transmission mechanism, an engine cylinder, an air intake system and an exhaust system. The engine cylinder includes a piston, a cylinder block, a dual-fuel cylinder head and a multi-injector assembly. The piston is disposed in the cylinder block. The driving mechanism is connected with the piston through the transmission mechanism and drives the piston to linearly move back and forth along a vertical direction of the cylinder block. The dual-fuel cylinder head is connected to an upper part of the cylinder block. The multi-fuel injection assembly includes a plurality of injectors. The plurality of injectors are of the same type and are all disposed on the dual-fuel cylinder head.
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公开(公告)号：US11421586B2
公开(公告)日：2022-08-23
申请号：US17565531
申请日：2021-12-30
Applicant: Harbin Engineering University
Inventor： Long Liu , Chen An , Zhichun Xu , Yuanheng Tang , Hao Zhao , Xiao Han , Junjie Liu , Qihao Mei
Abstract: The present disclosure provides a six-cylinder opposed free piston internal combustion engine generator. The generator comprises two free piston internal combustion engine sets, one opposed piston internal combustion engine set and two linear generator sets. Air entering cylinders is subjected to first-stage compression in low-pressure cylinder sets in the free piston internal combustion engine sets and the opposed piston internal combustion engine set and then subjected to second-stage compression in high-pressure cylinder sets, and a high pressure gas produced after the combustion is subjected to first-stage expansion in the high-pressure cylinder sets and then subjected to second-stage expansion in the low-pressure cylinder sets.
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公开(公告)号：US11735978B2
公开(公告)日：2023-08-22
申请号：US17564656
申请日：2021-12-29
Applicant: Harbin Engineering University
Inventor： Long Liu , Qihao Mei , Hao Zhao , Zhichun Xu , Yuanheng Tang , Chen An , Xiao Han , Junjie Liu
CPC classification number: H02K7/1869 , F01B7/02 , F02B71/00 , H02K5/04 , H02K7/10 , H02K7/1166 , H02K7/1884
Abstract: A free piston generator based on a rigid synchronous transmission system is provided, which belongs to the technical field of power energy. The present disclosure solves the problems of low power generation efficiency and low stability of the existing free piston generator. The free piston generator based on the rigid synchronous transmission system includes a first linear generator set, a second linear generator set, a rigid synchronous transmission assembly, two high-pressure cylinders arranged at two ends of the first linear generator set, and two low-pressure cylinders arranged at two ends of the second linear generator set. The combustion product is firstly subjected to first-stage expansion in the high-pressure cylinder and is then subjected to second-stage expansion in the low-pressure cylinder, which effectively increases the energy utilization in exhaust gas, also increases the expansion work, and further improves the thermal efficiency and the power generation efficiency of the free piston generator. By means of the rigid synchronous transmission assembly, high-pressure pistons and low-pressure pistons are always kept in stable phase operation, so as to avoid the problems of wall-impingement and insufficient pressure of compressed air due to the phase mismatching.
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