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公开(公告)号：JP2001242190A
公开(公告)日：2001-09-07
申请号：JP2000049666
申请日：2000-02-25
Applicant: NAT AEROSPACE LAB
Inventor： SHIGEMI HITOSHI , NAKATANI TERUOMI , SHINDO SHIGEMI , TAKIZAWA MINORU , ONUKI TAKESHI
Abstract: PROBLEM TO BE SOLVED: To provide an arithmetic processing algorithm for accurately performing arithmetic processing of flight velocity vector for indicating the level of velocity and an air flow angle and a static pressure for indicating altitude with a high update rate, in a wide-speed region from low speed to ultra-high speed in a flight velocity vector measurement system, using Pitot tube of a quadrangular pyramid type five-hole probe. SOLUTION: In the arithmetic processing algorithm, an approximation expression for obtaining an elevation angle α and a side slip angle β is expressed by a third-order polynomial for an elevation angle pressure coefficient Cα having a known number and a sideslip angle pressure coefficient Cβ, and each coefficient is expressed by a polynomial expression up to fifth order, regarding Mach number that can be calculated from a look-up table, the coefficient of the polynomial expression and the elevation angle α and the sideslip angle β can be calculated through simple arithmetic processing, by instantly inputting a known number into the approximation expression for making specific, and the Mach number can be calculated instantly from the lookup table by making specific a Mach pressure coefficient CM and an air flow angle pressure coefficient Cγ, and at the same time a wide-speed-region flight velocity vector measurement can be executed with a high update rate.
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公开(公告)号：JPH07189736A
公开(公告)日：1995-07-28
申请号：JP33380193
申请日：1993-12-27
Applicant: NAT AEROSPACE LAB , HONAMI SHINJI , ISHIKAWAJIMA HARIMA HEAVY IND
Inventor： SAKATA KIMIO , YANAGI RYOJI , MURAKAMI SATORU , SHINDO SHIGEMI , HONAMI SHINJI , SHIZAWA TAKAAKI , SAKAMOTO KAZUYUKI , SHIRAISHI KAZUO , KOMI JUNSUKE
Abstract: PURPOSE:To operate the intake of an air-breathing engine with a high pressure recovery factor and a low distortion characteristic concerning the intake side wall of a supersonic plane. CONSTITUTION:The side wall 21 of an external compression part is made compact in relation to the lamp 5 of an air intake 1, and a cutback 23 is disposed at the side wall in the vicinity of a cowl 6 part to reduce the loss of the side wall and to suppress the interference of a cowl part tip corner generated by induction vortex.
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公开(公告)号：JPH07189737A
公开(公告)日：1995-07-28
申请号：JP33380293
申请日：1993-12-27
Applicant: NAT AEROSPACE LAB , HONAMI SHINJI , ISHIKAWAJIMA HARIMA HEAVY IND
Inventor： SAKATA KIMIO , YANAGI RYOJI , MURAKAMI SATORU , SHINDO SHIGEMI , HONAMI SHINJI , SHIZAWA TAKAAKI , SAKAMOTO KAZUYUKI , SHIRAISHI KAZUO , KOMI JUNSUKE
Abstract: PURPOSE:To reduce the nonuniformity of total pressure distribution and improve the total pressure recovery factor of a diffuser by setting a range of forming side wall air bleed holes, disposed at both side walls of a throat part so as to bleed air from the inner surface of the side walls, behind the vertical shock wave generating position of the throat part. CONSTITUTION:An air bleed hole 24 for a side wall is formed of plural air bleed holes SB1, SB2, SB3 in front and in the rear of the formed position of a throat air bleed clearance 8, and these air bleed holes are formed at the inner wall of a side wall 21. The respective air bleed holes SB1-SB3 are formed of small hole groups numerously opened in the inner wall of the side wall 21, over the whole height area, connected to an air bleed system outward of an air intake passage 4, and so set as to allow the presence of bleed air to be switched and the bleed air flow to be set in that block range. Interference between vertical shock waves S5 and a boundary layer growing at a corner part between the side wall 21 and the face of the cowl 6 is generated in the vicinity of a throat, but such three-dimensional interference can be suppressed by the throat side wall air bleed.
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公开(公告)号：JPH06167416A
公开(公告)日：1994-06-14
申请号：JP32099692
申请日：1992-11-30
Applicant: NAT AEROSPACE LAB , ISHIKAWAJIMA HARIMA HEAVY IND
Inventor： SHINDO SHIGEMI , HOKARI TAKASHI
IPC: G01M9/06
Abstract: PURPOSE:To visualize the mode of flow without exerting effect on the flow through the gaps between blade ends in the device. CONSTITUTION:The blade pieces 4 fixed to one side of opposed passage walls in a cantilevered state and arranged so as to provide a gap to the other side passage wall, a visualizing fluid jet means 6 allowing a visualizing fluid 5 to flow out from the blade ends 4a of the blade pieces 4, the window parts 7 provided to the passage walls 2a, 2b on the side of the blade ends 4a and a planar light supply means 8 allowing planar light having a normal line almost parallel to blade chords 4b to be incident in the longitudinal direction of the blade pieces 4 from the outside are provided. Further, a planar light moving means 9 moving planar light in parallel to the direction along the blade chords 4b and the imaging means 10 arranged at the downstream position on the extension line of the blade chords 4b and imaging the reflected light due to the visualizing fluid of the irradiated planar light are provided. By the parallel movement under the irradiation with planar light, the flow through the gaps between the blade ends of the blade pieces 4 along the blade cords 4b is continuously visualized.
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