Study On Noise Reduction of Nozzle Shock Diamond Flow Destroyed by Flexible Components
Chung-Hwei Su,
Chien-Chih Chen,
Yi-Hua Pan,
Chen-Ching Ting
Issue:
Volume 2, Issue 2, April 2014
Pages:
12-17
Received:
5 March 2014
Accepted:
10 April 2014
Published:
20 April 2014
Abstract: It's well known that the high pressure flow running through the nozzle yields shock diamond flow which mainly causes the noise. This work employed flexible components on the nozzle outlet to destroy shock diamond flow and using micro color schlieren technique to visual the dispersion shock diamond. Experiments adjusted conditions of and mesh flexible components for optimal design. The results show that wire diameter 0.5mm of cross flexible component, away from nozzle 0.5cm and 1cm received the noise of 83.8dB, the reducing rate was ca.12.5%. The mesh 100 flexible component away from nozzle 0.5cm received the noise of 75.6dB, the reducing rate was ca. 21.17%.
Abstract: It's well known that the high pressure flow running through the nozzle yields shock diamond flow which mainly causes the noise. This work employed flexible components on the nozzle outlet to destroy shock diamond flow and using micro color schlieren technique to visual the dispersion shock diamond. Experiments adjusted conditions of and mesh flexib...
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Using Color Full-Scale Schlieren (CFSS) Technique to Improve Kitchen Exhaust Hood Performance
Chung-Hwei Su,
Chien-Chih Chen,
Li-Yu Yeh,
Yu-Cheng Hung,
Chen-Ching Ting
Issue:
Volume 2, Issue 2, April 2014
Pages:
18-23
Received:
5 March 2014
Accepted:
10 April 2014
Published:
20 April 2014
Abstract: This article uses color full-scale Schlieren for heat flow visualization of the kitchen exhaust hood. Using grease filters with same percentage of opening but different forms for measurements the heat flow escaping rate, noise, and air velocity of the kitchen exhaust hood under conditions of different percentage masking. The results show that using different grease filters without masking has no escaping heat flow. Employing the rectangular filter with side masking has the worst heat flow escaping. The top masking has also no heat flow escaping and the form with circular opening has the strongest absorbability. In this work, the smallest noise level is 65dB which appears at the situation of top masking. Moreover, kitchen exhaust hood without masking the air flow rate increase 3.17% of the air velocity than side masking.
Abstract: This article uses color full-scale Schlieren for heat flow visualization of the kitchen exhaust hood. Using grease filters with same percentage of opening but different forms for measurements the heat flow escaping rate, noise, and air velocity of the kitchen exhaust hood under conditions of different percentage masking. The results show that using...
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