Effects of flow incidence on aerothermal performance of transonic blade tip clearance flows

Gao, Jie; Zheng, Qun; Dong, Peng; Fu, Weiliang

doi:10.1016/j.energy.2017.07.175

Cited by 14 publications

(4 citation statements)

References 26 publications

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“…Within the figure, color variations denote tip surface heat flux variations, and greyscale variations denote flow density gradient distributions which were employed in these studies utilized squealer configurations [57][58][59][60][61][62][63][64][65][66][67][68][69][70][71][72], partial squealer configurations [61,64,69], and winglet configurations [73,74]. Smooth blade tips were employed by Thorpe et al [75], Green et al [59], Key and Arts [62], O'Dowd et al [76,77], Wheeler et al [78], Zhang et al [55,56], Shyam et al [79], Atkins et al [80], Wheeler and Saleh [70], Anto et al [81], Virdi et al [68], Wheeler and Sandberg [82], Li et al [65], Zhang et al [83], Zhang and He [84], Wang et al [69], Zhou [71], Jung et al [61], Gao et al [85], and Kim et al [64]. Most of these investigations (which involved experimental measurements) employed annular or linear cascades with stationary blades.…”

Section: Interactions Which Included Thermal Transport and Convectivementioning

confidence: 99%

Recent investigations of shock wave effects and interactions

et al. 2020

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Despite over fifty years of research on shock wave boundary layer effects and interactions, many related technical issues continue to be controversial and debated. The present survey provides an overview of the present state of knowledge on such effects and interactions, including discussions of: (i) general features of shock wave interactions, (ii) test section configurations for investigation of shock wave boundary layer interactions, (iii) origins and sources of unsteadiness associated with the interaction region, (iv) interactions which included thermal transport and convective heat transfer, and (v) shock wave interaction control investigations. Of particular interest are origins and sources of low-frequency, large-scale shock wave unsteadiness, flow physics of shock wave boundary layer interactions, and overall structure of different types of interactions. Information is also provided in regard to shock wave investigations, where heat transfer and thermal transport were important. Also considered are investigations of shock wave interaction control strategies, which overall, indicate that no single shock wave control strategy is available, which may be successfully applied to different shock wave arrangements, over a wide range of Mach numbers. Overall, the survey highlights the need for additional understanding of fundamental transport mechanisms, as related to shock waves, which are applicable to turbomachinery, aerospace, and aeronautical academic disciplines.

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Section: Interactions Which Included Thermal Transport and Convectivementioning

confidence: 99%

Recent investigations of shock wave effects and interactions

et al. 2020

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“…The field data sets of the indoor air temperature, TSV, and PMV for the summer and winter are extracted from Figures 4 and 5 of Yao et al, 38 respectively, using software GetData Graph Digitizer. Software GetData Graph Digitizer can reliably transfer data in figures into digital ones 56‐58 . The extracted data are lumped ones that are processed using the BIN method in terms of the indoor air temperature.…”

Section: Validation Through Study Of Naturally Ventilated Building Casesmentioning

confidence: 99%

Adaptive‐rational thermal comfort model: Adaptive predicted mean vote with variable adaptive coefficient

Zhang

2020

Indoor Air

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Thermal adaptations, as feedbacks of occupants to physical stimuli, extend thermal comfort zone thereby reducing building energy consumption effectively. The rational approach models thermal comfort from the perspective of the body's heat balance, but is limited in explaining the thermal adaptations. The adaptive approach of modeling thermal comfort can fully account for the thermal adaptations, but ignores the body's heat balance. To improve thermal comfort prediction, this study proposes an adaptive‐rational thermal comfort model, that is, an adaptive predicted mean vote with a variable adaptive coefficient (termed as arPMV). By linearly linking the negative feedback effects of the thermal adaptations to the ambient temperature according to the adaptive approach, the variable adaptive coefficient is linearly related to the reciprocal of the ambient temperature with two constants. The variable adaptive coefficient is determined by explicitly quantifying the two constants as the functions of the predicted mean vote, thermal sensation vote, and ambient temperature. The proposed arPMV is validated for naturally ventilated, air‐conditioned, and mixed‐mode buildings, with the mean absolute error and the robustness of the thermal sensation prediction reduced by 24.8%‐83.5% and improved by 49.7%‐83.4%, respectively.

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“…The exhaust volute is installed behind the last turbine stage for turbomachinery; gases exhausted from the turbine are expanded and deflected 90 degrees in the exhaust volute for reasons of tight space constraints, and then discharge vortically into the atmosphere or the downstream parts. 1,2 Since the flow in the exhaust volute is decelerated and prone to separation, and the 90 deg turning leads to highly vortical flows, resulting in significant energy losses, it was considered that the performance of the exhaust volute strongly influences the engine efficiency, and ultimately power output, from engines. Therefore, it is one of the critical components playing an important role in enhancing the modern turbomachinrey performance.…”

Section: Introductionmentioning

confidence: 99%

Advances in coupled axial turbine and nonaxisymmetric exhaust volute aerodynamics for turbomachinery

Gao

Tao

Huo

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part G:

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Marine, industrial, turboprop and turboshaft gas turbine engines use nonaxisymmetric exhaust volutes for flow diffusion and pressure recovery. These processes result in a three-dimensional complex turbulent flow in the exhaust volute. The flows in the axial turbine and nonaxisymmetric exhaust volute are closely coupled and inherently unsteady, and they have a great influence on the turbine and exhaust aerodynamic characteristics. Therefore, it is very necessary to carry out research on coupled axial turbine and nonaxisymmetric exhaust volute aerodynamics, so as to provide reference for the high-efficiency turbine-volute designs. This paper summarizes and analyzes the recent advances in the field of coupled axial turbine and nonaxisymmetric exhaust volute aerodynamics for turbomachinery. This review covers the following topics that are important for turbine and volute coupled designs: (1) flow and loss characteristics of nonaxisymmetric exhaust volutes, (2) flow interactions between axial turbine and nonaxisymmetric exhaust volute, (3) improvement of turbine and volute performance within spatial limitations and (4) research methods of coupled turbine and exhaust volute aerodynamics. The emphasis is placed on the turbine-volute interactions and performance improvement. We also present our own insights regarding the current research trends and the prospects for future developments.

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Effects of flow incidence on aerothermal performance of transonic blade tip clearance flows

Cited by 14 publications

References 26 publications

Recent investigations of shock wave effects and interactions

Recent investigations of shock wave effects and interactions

Adaptive‐rational thermal comfort model: Adaptive predicted mean vote with variable adaptive coefficient

Advances in coupled axial turbine and nonaxisymmetric exhaust volute aerodynamics for turbomachinery

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