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Title: The Upstream Installation Effect On The Cbpr Of Sonic Nozzle
Author: Lifen Wan1 Chunhui Li Yan Li Lishui Cui
Source: Flomeko 2013
Year Published: 2013
Abstract: The test for the critical back pressure ratio (CBPR) of a sonic nozzle by using an orifice plate is established, and six types of upstream conditions are set up. Preliminary experimental results show that the upstream conditions have almost no effect on the CBPR at throat Reynolds number larger than 1.1x105, but better upstream conditions or the longer lengths of upstream straight pipe can improve flow stability when throat Reynolds number smaller than 1.1x105, the upstream installation condition would have a significant impact on the CBPR, because of the occurrence of the premature unchoking phenomenon. Therefore, it is necessary to measure the CBPR in use for small throat diameter nozzle.

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