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Method of and apparatus for using an alternate pressure to measure mach number at high probe angles of attack
Method of and apparatus for using an alternate pressure to measure mach number at high probe angles of attack
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机译:在高探测攻角下使用交流压力测量马赫数的方法和装置
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摘要
A method of and apparatus for obtaining angle of attack, local static pressure and local pitot pressure from measured pressure values at ports of a probe having angle measuring ports with angle measuring axes lying in a plane and a pitot port having an axis lying along an axis in the plane bisecting the angle between the measuring ports. A table of known values of angle of attack relative to measured pressure ratio at measured Mach numbers determined by P1/Pm is stored in memory and used when P1 is greater than the pressure sensed at the pitot port (Pt′m), P1 is the pressure measured at the one of the angle measuring ports that is higher than the pressure measured at the other angle measuring port, and Pm is an average of the pressures at the angle measuring ports. The correlation of the ratio of measured pressures on the probe relative to angle of attack is determined using the known values P1/Pm at different angles of attack either in wind tunnel tests or by computer simulation. The known values are stored in a look-up table in an onboard air data computer. The values that have been stored then can be retrieved to solve for the correct angle of attack, using the measured pressures P1, P2 and Pt′m. The angle of attack values are used with an algorithm to determine local pitot and static pressure.
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机译:一种用于从探针的端口处的测得的压力值获得迎角,局部静压力和局部皮托管压力的方法和装置,该探针具有角度测量端口,该探针具有在平面内的角度测量轴线,并且皮托管端口的轴线沿轴线在将测量端口之间的角度平分的平面中。在由P 1 Sub> / P m Sub>确定的测量马赫数下,相对于测量压力比的已知迎角值表存储在内存中,并在P 时使用1 Sub>大于皮托管端口上的压力(P t′ m Sub>),P 1 Sub>是在角度测量端口之一处测得的压力P m Sub>是另一个角度测量端口上测得的压力的平均值。使用已知值P 1 Sub> / P m Sub>在风洞中的不同迎角下确定探头上测得压力与迎角的比率的相关性测试或通过计算机模拟。已知值存储在机载空中数据计算机的查找表中。然后,可以使用测得的压力P 1 Sub>,P 2 Sub>和P t′ m来检索已存储的值,以解决正确的迎角。 Sub>。迎角值与算法一起使用以确定局部皮托管和静压力。
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