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斯贝512-5W发动机上装用的CASC119型和CASC194型燃油调节器,基本上属于液压机械式,但与老式的液压机械式不同。老式的多属油汽比型,只根据压气机的输出压力一个参数来调节供油量。由于飞机的飞行速度和高度不断增大,飞行范围不断加宽,只感受压气机输出压力一个参数来进行燃油调节已不能满足要求,必须同时考虑发动机的转速、进气温度和进气压力三种可能的影响因素,才能保证发动机既不产生喘振,又能充分利用剩余油量以改善其加速性能。按无因次燃油流量特性曲线进行供油,可以解决上述三个因素同时变化时对供油量影响的问题,而由于在任何大气状态下供油曲线都是单一的这一特点,还可使燃油调节器的构造进一步简化。CASC119型和CASC194型燃油调节器就是按这个原则而设计的。CASC调节系统较之老式液压机械式调节器已有较大改进,但目前仍在不断发展。
Spey 512-5W engine used for loading CASC119 and CASC194 type fuel regulator, basically belongs to the hydraulic mechanical, but with the old hydraulic machinery different. Old-fashioned mostly oil-vapor ratio, only according to the compressor output pressure of a parameter to adjust the fuel supply. As the aircraft flight speed and altitude continue to widen the scope of the flight, only to feel the pressure of a compressor output pressure to adjust the fuel can not meet the requirements, we must also consider the engine speed, intake air temperature and intake pressure of three Possible factors that can ensure that the engine does not produce surge, but also make full use of remaining fuel to improve its acceleration performance. According to the dimensionless fuel flow characteristic curve, the oil supply can solve the problem that the above three factors simultaneously affect the amount of oil supply. However, since the oil supply curve is single in any atmospheric state, The construction of the fuel regulator is further simplified. CASC119 and CASC194 type fuel regulator is designed according to this principle. CASC regulation system has greatly improved compared with the old hydraulic mechanical regulator, but is still under continuous development.