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一、临界流文丘里喷嘴的最大允许背压比与临界压力比设临界流喷嘴的进口压力为p1、滞止压力为p0、喉部压力为p*、出口压力为p2。增大临界流喷嘴的滞止压力p0或减小临界流喷嘴的出口压力p2,即减小背压比(p2/p0),则流过临界流喷嘴的气体流量增加。当背压比减小到使临界流喷嘴达到临界压力比(p*/p0)c时,气体的流量达到最大,此时的背压比即为最大允许背压比,气体流速为当地声速。再继续降低背压比(p2/p0),流过临界流喷嘴的气体流速将保持不变。
First, the critical flow Venturi nozzle maximum allowable back pressure ratio with the critical pressure ratio of the critical flow nozzle inlet pressure p1, stagnation pressure p0, throat pressure p *, outlet pressure p2. Increasing the stagnation pressure p0 of the critical flow nozzle or decreasing the outlet pressure p2 of the critical flow nozzle, that is, decreasing the back pressure ratio (p2 / p0), increases the gas flow rate through the critical flow nozzle. When the back pressure ratio is reduced so that the critical flow nozzle reaches the critical pressure ratio (p * / p0) c, the maximum gas flow rate, the back pressure ratio at this time is the maximum allowable back pressure ratio, the gas flow rate of local sound velocity. Then continue to reduce the back pressure ratio (p2 / p0), through the critical flow nozzle gas flow rate will remain unchanged.