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一项由压力测量来确定漏气小孔尺寸的技术已有了新发展。该技术对于那些允许微小漏气而不允许较大漏气的场合尤为实用。整个测量装置由一根流速管连接一个装满水的测压计构成(如图所示)。将需检验的气密容器充气加压,流速管放在离漏气孔一定距离处,正对漏气喷射的中心线,这样便可测得该点的喷射动压强,而气体的静压强则在气密容器内测定,那么,漏气孔的尺寸就可根据下述近似式求得:D_0=0.3x(q_x/P_0)~(1/2)式中 D_0:漏气孔直径;x:流速管到漏气孔的距离;q_x:x 处的气流动压强;P_0:气密容器中的气体静压强(此式不适用于声速流的情况)。
A new development has been made in the technique of pressure measurement to determine the size of the leaky orifice. This technique is especially useful for those applications that allow small leaks without allowing large leaks. The entire measuring device consists of a flow tube connected to a manometer filled with water (as shown). The airtight container to be tested is inflated and pressurized, and the flow tube is placed at a distance from the blowhole, facing the center line of the blow-by gas, so that the jetting dynamic pressure at this point can be measured and the static pressure of the gas The size of the blowhole can be determined according to the following approximate formula: D_0 = 0.3x (q_x / P_0) ~ (1/2) where D_0: blowhole diameter; x : The distance from the flow tube to the blowhole; q_x: the gas flow pressure at x; P_0: the gas static pressure in the airtight container (this is not the case for sonic flow).