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现有飞机的气压高度表误差往往较大,如Ma_∞=0.9时高度误差达300m,严重影响了飞机的低空、超低空飞行。为了减小气压高度表的指示误差,通常采用补偿方法。气动补偿是有效的方法之一。 由于机头及进气道的阻塞作用,机头前方将产生一个正压场。受正压场影响,有限长空速管所测静压并非飞机所在高度的真实静压,其中包含较大的静压误差C_(pw)。气动补偿原理就是选用特定外形的补偿空速管,使气流流经静压孔时产生一定量的补偿负压
The error of the existing altimeter is usually large. For example, the height error of Ma_∞ = 0.9 is 300m, which seriously affects the low-altitude and low-altitude flight of the aircraft. In order to reduce the indication error of the barometric altimeter, the compensation method is usually adopted. Pneumatic compensation is one of the effective methods. Due to the jamming effect of the nose and the inlet, a positive pressure field will be generated in front of the nose. Under the effect of positive pressure field, the static pressure measured by a finite-length airspeed tube is not the true static pressure at the altitude of the aircraft, which includes the larger static pressure error C_ (pw). Pneumatic compensation principle is to use a specific shape of the compensation of air speed tube, so that when the air flow through the static pressure hole to produce a certain amount of compensation negative pressure