In the study of flow oscillation and discrete frequency noise of impinging jet, it is found that there is a critical pressure ratio for a given nozzle and a nozzle-to-plate distance.

　
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  • 發(fā)現對于給定的噴嘴和沖擊距離,存在一個(gè)壓比臨界點(diǎn),當壓比高于此臨界點(diǎn)值時(shí),流場(chǎng)振蕩和離散頻率噪聲被顯著(zhù)抑制乃至消失。
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