气室压力 meaning in English

plenum air pressure

They varied both chamber pressure and mixture ratio, making use of a stepfunction change in the oxidizer injection rate .
他们通过用氧化剂喷射速率阶跃函数变化的方法来改变气室压力和混合比。
Calculation of the pressure of the internal trajectory and the gas - operated chamber of the heavy caliber machine gun
大口径机枪内弹道及导气室压力的计算
The method is described as follows : the velocity of the moving part and the gas chamber pressure were measured with a dynamic test measurement system ; a dynamic model was built on force analysis of the moving part ; the total kinetic resistance replaced the horizontal friction and water resistance ; then the resistance - velocity relation curves at moving stages were obtained ; with the empirical formula of the gas chamber pressure and the resistance - velocity relation curves , the preliminary dynamic characteristics were analyzed and the structural form and key parameters of an underwater assault rifle were determined
具体方法为：由动力学测量系统测得活动件速度和气室压力；分析活动件的受力，建立动力学模型；以运动总阻力代替水平方向上的摩擦阻力和水阻力，获得各运动阶段的阻力速度关系曲线；利用气室压力经验公式和阻力速度关系曲线，对水下突击步枪进行初步的动力学分析，确定其构造型式及主要参数。