摘要
利用ISO6358—1（2013）变压法，通过测试，计算出气动消声器（以下简称消声器）的临界压力比6值在0．07～O．5范围内。该文指出，这个结论是错误的。原因是，对吸声材料是塑料纤维的消声器来说，在较高使用压力作用下，消声器材料会发生一定变形，导致声速流导C值变大。按此C值用变压法计算出的临界压力比6值会很低，甚至可能为负值。该文提出，使用作图法，可简便测出消声器的临界压力比6值和临界流态下的有效截面积S值（相当于声速流导C值），且测出值可信。
The use of ISO 6358-1 （2013） method for variable upstream pressure test, through the test, the calculation of the pneumatic silenc- er （hereinafter referred to as the silencer） of critical back-pressure ratio b value in the range of 0.07 to 0.5. This paper points out, this conclu- sion is wrong. The reason is that sound absorption material is plastic fiber silencer, in the use of higher pressure,silencer will happen some material deformation, resulting in sonic conductance C value becomes larger. According to the C value of critical back-pressure ratio is cal- culated by method for variable upstream pressure test,of the b value will be very low, even may be negative. In this paper, the use of map- ping method can be conveniently measured critical back- pressure ratio b value of silencer and effective area S value under the critical flow （corresponding to sonic conductance C value）, and measured value is creditable.
出处
《液压气动与密封》
2015年第5期35-38,共4页
Hydraulics Pneumatics & Seals
基金
浙江省质量技术监督系统科研计划项目(20140244)
关键词
气动消声器
国际标准
临界压力比
有效截面积
吸声材料
pneumatic silencer
international standard
critical back-pressure ratio
effective area
sound absorption material
