Study on a Pi-type mean flow acoustic engine capable of wind energy harvesting using a CFD model
Abstract A mean flow with remarkable kinetic energy passing deep cavities excites stable acoustic oscillations at certain mean flow velocity ranges. Based on this aerodynamic effect, a mean flow acoustic engine (MFAE) can be built to convert wind energy or other fluid energy into acoustic energy. The MFAE without mechanical moving parts has potential applications in driving thermoacoustic refrigerators and transducers to provide cooling power and electrical power, respectively. With two resonators spaced on one side of the driver, a Pi-type MFAE can be built. A computational fluid dynamics model with large-eddy simulation of turbulence was used to simulate the operation performance of a Pi-type MFAE. With mean flow velocity below 62.22m/s, five acoustic modes with different pressure wave frequencies were observed in the Pi-type MFAE. Pressure amplitudes in the resonators, phase lags between two resonators, hydrodynamic vortices shedding and non-dimensional Strouhal numbers were presented. We found that the maximum pressure amplitude happens at the third acoustic mode with mean flow velocity 49.98m/s. The maximum non-dimensional pressure amplitudes at four acoustic modes were found at Strouhal number close to 0.4 indicating the first hydrodynamic mode. The Strouhal number suggests an optimal working condition to harness wind energy. Furthermore, it is found that the phase difference between the pressure waves at the front resonator and at the rear resonator of the Pi-type MFAE differs from the cross-junction MFAE. Appropriately utilizing the phase difference between two resonators could enhance the energy exploitation. Highlights A Pi-type mean flow acoustic engine CFD model was built and the operation performance of the engine was obtained. The acoustic characteristics and hydrodynamic characteristics were analyzed. Running the engine in the first hydrodynamic and acoustic mode is most efficient in converting energy. Pressure wave phase differences between two resonators were obtained and analyzed. Pi-type mean flow acoustic engine differs from cross-junction mean flow acoustic engine in phase lag.
- 원문이 없습니다.
유료 다운로드의 경우 해당 사이트의 정책에 따라 신규 회원가입, 로그인, 유료 구매 등이 필요할 수 있습니다. 해당 사이트에서 발생하는 귀하의 모든 정보활동은 NDSL의 서비스 정책과 무관합니다.
원문복사신청을 하시면, 일부 해외 인쇄학술지의 경우 외국학술지지원센터(FRIC)에서
무료 원문복사 서비스를 제공합니다.
NDSL에서는 해당 원문을 복사서비스하고 있습니다. 위의 원문복사신청 또는 장바구니 담기를 통하여 원문복사서비스 이용이 가능합니다.
- 이 논문과 함께 출판된 논문 + 더보기