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首页> 外文期刊>Journal of Aerospace Sciences and Technologies >ESTIMATION OF DISCHARGE COEFFICIENT OF COMPARTMENT VENTING DURING ATMOSPHERIC REENTRY OF THE SPACE CAPSULE
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ESTIMATION OF DISCHARGE COEFFICIENT OF COMPARTMENT VENTING DURING ATMOSPHERIC REENTRY OF THE SPACE CAPSULE

机译：空间胶囊大气再入中隔室排气排出系数的估计

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The problem of re-pressurization of compartment of reentry space capsule through vent holes is formulated using equation of mass conservation, isentropic relation and perfect gas equation of state. Resulting, a one-dimensional nonlinear compressible transient equation is numerically integrated employing fourth-order Runge-Kutta scheme in order to obtain compartment pressure using knowledge of the discharge coefficient of the orifice. An inverse venting analysis is carried out to estimate the discharge coefficient using measured and computed compartment pressure time history during the reentry phase of the space capsule. The inverse venting problem is solved using the Newton-Raphson method coupled with a direct-search algorithm utilizing pseudo-random numbers. The inverse venting algorithm estimates the discharge coefficient of the vent holes in a stepwise manner as a function of the reentry flight Mach number. The reconstructed compartment differential pressure is compared with pre- and post-flight data. It is observed that the estimated values of the discharge coefficient depend on the accuracy of the transmitted telemetry data, dispersion of the reentry trajectory, pressure acting on the base of the capsule and atmospheric pressure.
机译：使用质量守恒，等式熵，状态的完美气体方程，配制了通过通气孔再加压再入空间胶囊隔室的问题。由此产生的一维非线性可压缩瞬态等式在数量上集成使用四阶径 - 库特拉方案，以便使用孔口的放电系数的知识获得隔室压力。在空间胶囊的再入阶段期间使用测量和计算的隔间压力时间历史来进行逆通气分析以估算放电系数。使用具有利用伪随机数的直接搜索算法耦合的Newton-Raphson方法解决了逆通路问题。逆通路算法以逐步的方式估计通气孔的放电系数作为再入式飞行马赫数的函数。将重建的隔间差压与飞行前和飞行后的数据进行比较。观察到，放电系数的估计值取决于透射遥测数据的准确性，再入轨迹的分散，压力作用在胶囊基部和大气压上。

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