倒置喷管发动机性能测定方法的比较与分析

采用三种试验方案对喷管倒置１５０°引起的比冲损失进行了测定、分析和比较。结果表明，双室串并发动机顺倒置四喷管引起的比冲相对损失为１．８％左右；如果将顺置采用单喷管，那么该项损失大约为４．１％。采用双室串并发动机时，测试系统和判读系统误差不能进入测试数据中，所以它比单独采用顺置和倒置时测定的数据可靠。

COMPARISON AND ANALYSES ON DETERMINING METHODS FOR PROPERTIES OF INVERSE NOZZLE ROCKET MOTORS

he loss of impulses caused by inverse nozzles with 150° has been determined, analyzed and compared through three kinds of tests. It turns out that the relative loss of impulses caused by common and inverse 4 nozzles in double-chamber series-parallel rocket motors is about 1. 8 %. When a single nozzle was used in solid rocket motors with common nozzle, the loss would be about 4. 1%. Since the errors of measuring and deciding systems can not be led into measurement data, determined data is more reliable than those determined by single common and inverse nozzles, when double-chamber series-parallel rocket motors are used.