根据美国空军签定的合同,普拉特·惠特尼公司将要对未来火箭发动机高度补偿喷管的性能进行估价.现有助推器发动机,包括航天飞机的发动机,都具有固定的几何尺寸的喷管.此种喷管设计必须综合考虑发射和入轨的理想环境变化.根据新的设计,喷管几何尺寸是可 According to a contract signed by the U.S. Air Force, Pratt & Whitney will evaluate the performance of future rocket engine highly compensated lances. Existing booster engines, including the shuttle’s engines, have a fixed geometry Nozzle. This nozzle design must take into account the launch and into the orbit of the ideal environmental changes. According to the new design, the nozzle geometry is