http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
임펠러 특성에 따른 R134a 터보 냉동기용 원심압축기의 성능 평가
하경구(Kyoung Ku Ha),정봉철(Bong Cheol Chung),강신형(Shin Hyoung Kang) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.4
The present study has been conducted to design a high efficiency impeller for a centrifugal compressor with the refrigerant, R134a. The effects of the inlet, the outlet blade angle and the blade lean angle at the impeller outlet were investigated using a commercial code. The numerical analyses were mainly carried out at the design point and the 60% flow-rate point of the compressor. Flow characteristics of impellers and diffusers were analyzed in detail including flow angle distributions, pressure contours and streamlines. A finally designed compressor was also investigated experimentally to check compression performance. The analysis data coincide with the test results of the compressor. The data obtained in this study would be useful for a design of an impeller to improve R134a compressor performance.
연료전지차의 터보블로워 성능 개선을 위한 설계방법과 평가
하경구(Ha Kyoung Ku),성선모(Sung Sun Mo),강신형(Kang Shin Hyoung),권혁률(Keon Hyeok ryul),이창하(Lee Chang Ha) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
The turbo blower used for fuelcell vehicles is a principle part of the air supplying system. It tells on the whole system efficiency because the driving motor consumes an amount of power. And the noise is caused by it which is the only moving parts of the fuelcell system. Therefore It is improving the turbo blower in the efficiency and the noise respect that furnishes a key for the development of outstanding fuelcell vehicles. This study was designed to secure a design technique of the turbo blower. Results of performance analysis of the existing turbo blower using CFD are included in the paper. A design procedure for improving the blower using in-house codes and the results are also described.
김태호(Tae Ho Kim),문창국(Chang Gook Moon),황성호(Sung Ho Hwang),이종성(Jongsung Lee),박건웅(Gun Woong Park),양현섭(Hyun Sup Yang),하경구(Kyoung-Ku Ha),이창하(Chang Ha Lee) 한국소음진동공학회 2019 한국소음진동공학회 논문집 Vol.29 No.3
This paper evaluates the NVH characteristics of an air compressor for fuel cell electric vehicles(FCEVs) by conducting experimental as well as on-road tests. For the experiment, five eddy-current-type displacement sensors measured the vibration amplitudes of the shaft at the impeller and thrust runner ends, one three-axis accelerometer measured the acceleration of the compressor housing, and one microphone placed 1 m away from the test air compressor measured the acoustic pressure during rotor speed-up and coastdown up to 100 k r/min. For the on-road test, the air compressor was installed under the stack frame of a proto-type FCEV. The stack frame supports a fuel cell stack and is fixed on the sub-frame of the FCEV. In addition to five eddy-current-type displacement sensors and one three-axis accelerometer installed in the air compressor housing, two three-axis accelerometers installed on the stack frame and the sub-frame measured their accelerations during FCEV speed-up and break-down up to 115 km/h. One microphone installed 30 cm behind the air compressor recorded the acoustic pressure. All measured displacements, accelerations, and acoustic pressures were analyzed in the frequency domain. The test results revealed that the air compressor has the highest rotor vibrational amplitude and housing acceleration at the maximum rotor speed of 100 k r/min. However, the vibrations of the air compressor are well dampened while transmitteed to the sub-frame of the FCEV.