Reduction of Noise and Input Power in Fuel Cell Blower by Controlling Flow Path

탁봉열(Tak, Bong-Yeol),김찬규(Kim, Chan-Kyu),이소아(Lee, So-A),장춘만(Jang, Choon-Man) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.11

This paper describes performance enhancement of a fuel cell's blower by controlling flow path. Different duct diameter at the inlet and outlet of the blower is selected for reducing blower noise level and input power. Hole diameter and the number of hole at the check valve are tested to reduce the input power of the blower. Two types of blower, fuel pressurized blower and cathode blower, are considered in the present study. Throughout experimental measurements of the test blowers, it is found that duct diameter is effective to reduce noise level and input power in the fuel cell blower. Noise reduction due to the optimal duct diameter at the outlet is more effective when flow rate is relatively large. That is, cathode blower has larger noise reduction compared to fuel pressurized blower because of larger flower rate. Input power of the blower can be reduced by controlling the hole diameter and the number of hole at the check valve.

Development of 4 Types of Fuel Cell's Blower

탁봉열(Tak, Bong-Yeol),김찬규(Kim, Chan-Gyu),이소아(Lee, So-A),장춘만(Jang, Chun-Man) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.05

This paper describes development procedure of the four types of fuel cell's blowers: pressurized fuel blower, selective oxidation air blower, cathode air blower, and burner air blower. Diaphragm blowers having two heads are selected to maintain force balance when the rotating arms are moving by the driving motor. Dimensions of a diaphragm cavity is designed according to the optimal design procedure using numerical simulation and experimental measurement. Experimental apparatus is designed by considering the bower characteristics having low flow rate and high pressure. Test blower is operated by a diaphragm, which has suction and discharge port on the top of the blower. For analyzing the internal flow of the blower, three-dimensional Navier-Stokes analysis is introduced in the present study. Throughout the optimal design of the blowers, blower performance is enhanced by reducing the unbalance motion of the rotating arm and loss region in the diaphragm cavity.

Performance Enhancement of 20kW Regenerative Blower Using Design Parameters

장춘만,전현준 한국유체기계학회 2014 International journal of fluid machinery and syste Vol.7 No.3

This paper describes performance enhancement of a regenerative blower used for a 20 kW fuel cell system. Two design variables, bending angle of an impeller and blade thickness of an impeller tip, which are used to define an impeller shape, are introduced to enhance the blower performance. Internal flow of the regenerative blower has been analyzed with threedimensional Navier-Stokes equations to obtain the blower performance. General analysis code, CFX, is introduced in the present work. SST turbulence model is employed to estimate the eddy viscosity. Throughout the numerical analysis, it is found that the thickness of impeller tip is effective to increase the blower efficiency in the present blower. Pressure is successfully increased up to 2.8% compared to the reference blower at the design flow condition. And efficiency is also enhanced up to 2.98 % compared to the reference one. It is noted that low velocity region disturbs to make strong recirculation flow inside the blade passages, thus increases local pressure loss. Detailed flow field inside the regenerative blower is also analyzed and compared.

Performance Enhancement of 20kW Regenerative Blower Using Design Parameters

Jang, Choon-Man,Jeon, Hyun-Jun Korean Society for Fluid machinery 2014 International journal of fluid machinery and syste Vol.7 No.3

This paper describes performance enhancement of a regenerative blower used for a 20 kW fuel cell system. Two design variables, bending angle of an impeller and blade thickness of an impeller tip, which are used to define an impeller shape, are introduced to enhance the blower performance. Internal flow of the regenerative blower has been analyzed with three-dimensional Navier-Stokes equations to obtain the blower performance. General analysis code, CFX, is introduced in the present work. SST turbulence model is employed to estimate the eddy viscosity. Throughout the numerical analysis, it is found that the thickness of impeller tip is effective to increase the blower efficiency in the present blower. Pressure is successfully increased up to 2.8% compared to the reference blower at the design flow condition. And efficiency is also enhanced up to 2.98 % compared to the reference one. It is noted that low velocity region disturbs to make strong recirculation flow inside the blade passages, thus increases local pressure loss. Detailed flow field inside the regenerative blower is also analyzed and compared.

공기흐름 변경으로 임펠러의 수명연장과 전력비 절감을 위한 송풍기 개발을 위한 실험적 연구

김일겸,박우철,손상석,김용남 한국산학기술학회 2020 한국산학기술학회논문지 Vol.21 No.11

In this study, the prototype of a blower was designed and made to develop a long-life blower with a volume flow rate of 10,000 m3/min with a required total pressure efficiency of 83% or more. Five experimental impellers with various lengths of dust deflectors were manufactured and used for the erosion experiments. The erosion test was conducted by operating for 160 hours in a self-produced closed loop-type erosion test apparatus. A prototype of a model blower was designed, fabricated, and tested. The results revealed a total pressure, air volume flow rate, and efficiency of 690.6 mmAq, 16,243.6 m3/min, and 83.6%, respectively, as the result of conversion to a blower based on the measured value of the blower model. The prototype was designed and fabricated as the experimental erosion equipment of the blower. A blower with a dust deflector was developed by performing the erosion experiments under harsh conditions. The blower showed an improved effect of more than 190% based on the wear thickness of the impeller compared to a conventional blower without a dust deflector. 본 연구는 요구되는 전압효율이 83% 이상인 풍량 10,000 m3/min급의 장수명 송풍기를 개발하기 위하여 송풍기를 설계·제작하여 송풍기 성능시험과 침식 실험을 통하여 개발품에 대한 성능을 확인하였다. Dust deflector의 영향을 살펴보기 위하여 각기 다른 길이의 Dust deflector를 갖는 5가지의 실험용 임펠러를 제작하여 침식 실험을 수행하였다. 가혹한 조건으로 실험을 수행하기 위하여 침식을 유발하는 분진 대체재로 1kg의 스틸 쇼트 볼(Φ0.2 mm)을 사용하였다. 자체 제작한 폐루프 타입의 침식 실험 장치에서 160시간 동안 연속으로 가동 운전하여 실험하였다. Dust deflector에 의한 침식성능을 평가하기 위하여 마모두께를 측정하였다. 3차원 스캐너로 침식 실험 전 형상과 침식 실험 후 형상을 스캐닝하여 마모두께를 측정하였다. 모델 송풍기를 설계·제작하여 송풍기 성능을 시험한 결과, 모델 송풍기 측정값을 기준으로 개발 송풍기로의 환산 결과 전압 690.6 mmAq, 풍량 16,243.6 m3/min, 효율 83.6 %로 나타났다. 송풍기의 침식 실험 장치를 설계·제작하여 가혹한 조건으로 침식 실험을 수행하여 dust deflector가 부착된 송풍기인 개발 송풍기가 dust deflector가 없는 기존 송풍기에 비하여 임펠러 마모두께를 기준으로 190 % 이상의 개선 효과가 있는 것으로 나타났다.

건물 연료전지용 재생블로어 설계변수 특성연구

장춘만(Choon-Man Jang),이종성(Jong-Sung Lee) 대한설비공학회 2012 설비공학 논문집 Vol.24 No.10

This paper describes the blower performance used for single-stage high pressure regenerative blower. The blower considered is widely applied to the field of a fuel cell system, a medical equipment and a sewage treatment plant. Flow rate and rotating frequency of a impeller of the blower are considered as design parameters for the proper operation of the blower. Three-dimensional Navier-Stokes equations are introduced to analyze the performance and internal flow of the blower. Relatively good agreement between experimental measurements and numerical simulation is obtained. Throughout a numerical simulation, it is found that small and stable vortical flow generated inside the blade passage is effective to increase pressure and efficiency of the blower. Large local recirculation flow having low velocity in the blade passage obstructs the generation of stable vortical flow, thus increases the pressure loss of the blower. Detailed flow field inside the blower is also analyzed and discussed.

The Performance Analysis Method with New Pressure Loss and Leakage Flow Models of Regenerative Blower

이찬,길현권,김광영 한국유체기계학회 2015 International journal of fluid machinery and syste Vol.8 No.4

For efficient design process of regenerative blower, the present study provides new generalized pressure and leakage flow loss models, which can be used in the performance analysis method of regenerative blower. The present performance analysis on designed blower is made by incorporating momentum exchange theory between impellers and side channel with mean line analysis method, and its pressure loss and leakage flow models are generalized from the related fluid mechanics correlations which can be expressed in terms of blower design variables. The present performance analysis method is applied to four existing models for verifying its prediction accuracy, and the prediction and the test results agreed well within a few percentage of relative error. Furthermore, the present performance analysis method is also applied in developing a new blower used for fuel cell application, and the newly designed blower is manufactured and tested through chamber-type test facility. The performance prediction by the present method agreed well with the test result and also with the CFD simulation results. From the comparison results, the present performance analysis method is shown to be suitable for the actual design practice of regenerative blower.

Vibration analysis on the rolling element bearing-rotor system of an air blower

Wu Hao,Zhou Qiong,Zhang Zhiming,An Qi 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.3

Air blowers are widely used in industry. The vibration of the rolling bearing-rotor is a key factor in the blower’s performance because it significantly influences the security and working life of the whole system. In previous research on the vibration characteristics of the air blower, the supporting rolling element bearing was always simplified as a particle on a shaft with radial stiffness and damping coefficient. Such simplification neglects the effects of the bearing structure on the vibration performance of the rotor system. In this paper, a numerical model of the bending stiffness of the tapered roller bearing was established through mechanics and deformation analysis. On the base of the model, a new TMM (transfer matrix method) for bearing-rotor system was established; the new TMM considers the influences of the bearing structure on the vibration of the rotor system. Furthermore, modal analysis on an air blower rotor system was carried out by using the new TMM, and the mode shape, critical speed and unbalance response of the air blower system were obtained. The same blower rotor was also analyzed by FEM to verify the validation of the new TMM, showing that the new method proposed in this paper for vibration characteristics calculation of an air blower is credible.

The Performance Analysis Method with New Pressure Loss and Leakage Flow Models of Regenerative Blower

Lee, Chan,Kil, Hyun Gwon,Kim, Kwang Yeong Korean Society for Fluid machinery 2015 International journal of fluid machinery and syste Vol.8 No.4

For efficient design process of regenerative blower, the present study provides new generalized pressure and leakage flow loss models, which can be used in the performance analysis method of regenerative blower. The present performance analysis on designed blower is made by incorporating momentum exchange theory between impellers and side channel with mean line analysis method, and its pressure loss and leakage flow models are generalized from the related fluid mechanics correlations which can be expressed in terms of blower design variables. The present performance analysis method is applied to four existing models for verifying its prediction accuracy, and the prediction and the test results agreed well within a few percentage of relative error. Furthermore, the present performance analysis method is also applied in developing a new blower used for fuel cell application, and the newly designed blower is manufactured and tested through chamber-type test facility. The performance prediction by the present method agreed well with the test result and also with the CFD simulation results. From the comparison results, the present performance analysis method is shown to be suitable for the actual design practice of regenerative blower.

연료전지용 다이어프램 블로어 성능특성 해석

장춘만(Choon-Man Jang),임수정(Soo Jung Lim) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.6

This paper describes performance characteristics of a fuel cell's blower, which is mainly used for detached house and apartment. Experimental apparatus is designed by considering the bower characteristics having low flow rate and high pressure. Test blower is operated by a diaphragm, which has suction and discharge port on the top of the blower. For analyzing the internal flow of the blower, three-dimensional Navier-Stokes analysis is introduced in the present study. Hybrid grid system consisted of hexa hedral , tetra hedral and prism mesh is adopted to describe the complex geometry of the diaphragm blower. Throughout the numerical simulation, it is found that the present modeling for numerical simulation is suitable for analyzing the unsteady flow inside the cavity of the blower. Detailed flow analysis is also analyzed using the results obtained by numerical simulation.