公开(公告)号：JP2003214114A

公开(公告)日：2003-07-30

申请号：JP2002337345

申请日：2002-11-21

Applicant: UNITED TECHNOLOGIES CORP

Inventor： KARPMAN BORIS ,  SHADE JOHN L ,  KANE DANIEL E

IPC: F01D11/08 ,  F01D11/24 ,  F01D25/24 ,  F02C7/00 ,  F02C7/18 ,  F02C7/28 ,  F04D29/54 ,  F04D29/58 ,  G05B17/02

Abstract: PROBLEM TO BE SOLVED: To improve a clearance control in a turbomachine. SOLUTION: A system and method for controlling a clearance of the turbomachine 10 includes adjusting machine case cooling air 33 in accordance with a difference between a desired clearance and a actual clearance. An accurate estimate of the actual clearance is performed by a real time mathematical model of an on-board engine controller 40. The model computes each thermal growth of the turbomachine components 41, 43 and 50 with a difference equation derived from a closed form solution of a 1st order differential equation obtained through the application of a 1st law of thermodynamics. The resulting equation is conveniently formulated in terms of equivalent time constant and steady state growth both of which are correlated with thermo-physical characteristics of multiple fluid streams 48 exchanging heat with the components 41, 43 and 50. COPYRIGHT: (C)2003,JPO

公开(公告)号：DE60215602T2

公开(公告)日：2007-08-23

申请号：DE60215602

申请日：2002-11-21

Applicant: UNITED TECHNOLOGIES CORP

Inventor： KARPMAN BORIS ,  SHADE JOHN L ,  KANE DANIEL E

IPC: F01D11/08 ,  F01D11/24 ,  F01D25/24 ,  F02C7/00 ,  F02C7/18 ,  F02C7/28 ,  F04D29/54 ,  F04D29/58 ,  G05B17/02

Abstract: A system and method of controlling clearance in a turbomachine (10) includes adjusting the machine case cooling (33) air in response to the difference between the desired clearance and the actual clearance. An accurate estimate of the actual clearance is made with a real time mathematical model on-board engine controller (40). The model computes thermal growth of the turbomachine components (41, 43, 50) each with a difference equation derived from a closed form solution to the 1 order differential equation obtained through the application of 1 law of thermodynamics. The resulting equation is conveniently formulated in terms of equivalent time constant and steady state growth both correlated with thermo-physical characteristics of multiple fluid streams (48) exchanging heat with the component (41, 43, 50). The solution is applied over a time step of the control software. Approximating coefficients are strategicay placed in the model to allow calibration of the model to a particular version of the engine hardware.

公开(公告)号：DE60215602D1

公开(公告)日：2006-12-07

申请号：DE60215602

申请日：2002-11-21

Applicant: UNITED TECHNOLOGIES CORP

Inventor： KARPMAN BORIS ,  SHADE JOHN L ,  KANE DANIEL E

IPC: F01D11/08 ,  F01D11/24 ,  F01D25/24 ,  F02C7/00 ,  F02C7/18 ,  F02C7/28 ,  F04D29/54 ,  F04D29/58 ,  G05B17/02

Abstract: A system and method of controlling clearance in a turbomachine (10) includes adjusting the machine case cooling (33) air in response to the difference between the desired clearance and the actual clearance. An accurate estimate of the actual clearance is made with a real time mathematical model on-board engine controller (40). The model computes thermal growth of the turbomachine components (41, 43, 50) each with a difference equation derived from a closed form solution to the 1 order differential equation obtained through the application of 1 law of thermodynamics. The resulting equation is conveniently formulated in terms of equivalent time constant and steady state growth both correlated with thermo-physical characteristics of multiple fluid streams (48) exchanging heat with the component (41, 43, 50). The solution is applied over a time step of the control software. Approximating coefficients are strategicay placed in the model to allow calibration of the model to a particular version of the engine hardware.