Loss development analysis of a micro-scale centrifugal compressor

Tiainen, Jonna; Jaatinen-Värri, Ahti; Grönman, Aki; Fischer, Tore; Backman, Jari

doi:10.1016/j.enconman.2018.04.014

Cited by 20 publications

(4 citation statements)

References 40 publications

(38 reference statements)

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“…This relation showed that at a low specific speed, efficiency drops due to an increase in the frictional losses in the vane passages and the disc friction. However, at a high specific speed, efficiency drops due to an increase in the aerodynamic losses resulted from the high relative velocity levels [15]. The specific speed expression is defined as follow Ns =…”

Section: Centrifugal Compressor Designmentioning

confidence: 99%

Design and simulation of turbogenerators for series hybrid electric vehicles

Khoury

Nader

2021

Energy Conversion and Management

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Section: Centrifugal Compressor Designmentioning

confidence: 99%

Design and simulation of turbogenerators for series hybrid electric vehicles

Khoury

Nader

2021

Energy Conversion and Management

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“…Many models are modular, adding various losses introduced by various physical or endwall effects. One example is the tip clearance loss which was scrutinized both in experimental studies (Doustmohammadi et al , 2013; He and Zheng, 2018a, 2018b; Chaowei et al , 2019) as well as numerical ones (Tiainen et al , 2016, 2018; Chen and Gong, 2014; Yang et al , 2009). A theoretical framework is presented by Van den Braembussche (1984) showing the link between primary and secondary flows as well as blade count and endwall (hub and shroud) geometry shape.…”

Section: Introductionmentioning

confidence: 99%

Rake impact on turboshaft compressors, a numerical study

Drãgan

Dumitrescu

Mălăel

et al. 2020

AEAT

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Purpose Turboshaft engines usually include one centrifugal compressor due to its high-pressure ratio, stability and compactness. Many designers rely on positive raking to decrease tip gap flow and therefore losses. However recent optimization studies revealed geometries contradicting this canonic view. Hence, this paper aims to investigate how the rake angle alone can influence performance and to which extent. Design/methodology/approach A turboshaft representative impeller was chosen and altered for null and +/−30° rake angles. Menter's shear stress transport model is used for steady computational fluid dynamics simulations, sweeping the nominal speedline at various tip clearances. Backsweep distribution is identical in all cases, isolating rake influence. Findings Pressure ratio was lowered for the both positively and negatively raked blades, but through distinct aerodynamic mechanisms. Although the flow through the tip gap was lower for the positive rake, this is due to lower blade loading. Splitter comparison reveal that these effects are more pronounced in the radial regions. Practical implications Some of the findings may extend beyond turboshaft engines, into turbochargers, home appliances or industrial blowers. However, all extrapolations must consider specific differences between these applications. Turboshaft compressors designers can benefit from this study when setting up their free parameters and penalty functions in the early concept stages. Originality/value Only few similar studies can be found in the literature to date, none similar to turboshaft applications. Also, this impeller is designed to eliminate leading edge shocks and suction side boundary layer separation, which makes it easier to isolate the tip gap flow effects. The authors also provide a framework on which semi-empirical design equations can be further developed to incorporate rake into 1D design tools.

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“…The influence of the tip clearance on the turboexpander is also particularly significant, and the tip clearance loss is mainly concentrated on the suction surface of the induction wheel to the mid‐string section . Tiainen et al studied the development of Reynolds number loss in a centrifugal compressor without a vane diffuser and distinguished the losses caused by different causes. Soo‐Yong Cho et al experimentally studied the loss of incidence in different parts.…”

Section: Introductionmentioning

confidence: 99%

Analysis of impeller blade parameters and tip clearance of turboexpander in organic Rankine cycle system

Jia

Wang

Zhang

et al. 2019

Energy Science & Engineering

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The optimization of a turboexpander can significantly improve the performance of the organic Rankine cycle (ORC) system, which can use in low‐temperature geothermal energy for high‐efficiency power generation. Therefore, this paper studies and optimizes the expander in the ORC of low‐temperature geothermal energy around 90°C. Firstly, the influence of impeller parameters on the performance of the expander is analyzed. Then, the grid is divided by the turbine mesh, and numerical simulation is performed by CFX. The gas state equation selects the Peng–Robinson equation, and the turbulence equation selects the SST model. Finally, the effect of tip clearance on the performance of the expander was studied. Research on impeller blade parameters shows that with the increase in the outer diameter of the impeller blade outlet, the isentropic efficiency of the expander decreases, and the output power increases. As the increase in the angle between the direction of the impeller blade and the meridian plane, the outlet velocity of the blade increases, the temperature decreases, and the efficiency and control of the turboexpander will decrease. The meridional section width has few effects on the performance of the expander. The study of the tip clearance by numerical simulation shows that the existence of tip clearance will cause clearance flow between pressure surface and suction surface that interferes with the mainstream direction. When the tip clearance increases from 0 mm to 1.2 mm, the efficiency of the expander is reduced by 8.9%.

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Loss development analysis of a micro-scale centrifugal compressor

Cited by 20 publications

References 40 publications

Design and simulation of turbogenerators for series hybrid electric vehicles

Design and simulation of turbogenerators for series hybrid electric vehicles

Rake impact on turboshaft compressors, a numerical study

Analysis of impeller blade parameters and tip clearance of turboexpander in organic Rankine cycle system

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