Influence of the volute design parameters on the performance of a centrifugal compressor of an aircraft turbocharger

Hassan, Ahmed S.

doi:10.1243/09576509jpe436

Cited by 16 publications

(8 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Steglich et al [15] developed an asymmetric diffuser with an internal volute. How different volute design parameters influence performance and efficiency has recently been investigated by several authors [16][17][18][19][20], some of which focused on the tongue area of the volute and how to optimize its design [21,22]. The latest work of Dai et al (2010) showed how different volute designs impact the influence of the volute tongue region on the flow field of a subsonic compressor at off-design conditions [20].…”

Section: Introductionmentioning

confidence: 99%

Influence of the volute on the flow in a centrifugal compressor of a high-pressure ratio turbocharger

Zheng

Huenteler

Yang

et al. 2010

Proceedings of the Institution of Mechanical Engineers, Part A:

View full text Add to dashboard Cite

Abstract:The asymmetric influence of the volute on the flow in a transonic, high-pressure ratio centrifugal compressor at off-design conditions was investigated. Fully three-dimensional viscous steady-state computational fluid dynamics (CFD) was applied to simulate the flow in a 4.2:1 design pressure ratio compressor for automotive application. Computed performance characteristics are presented for low-and high-pressure ratio operating conditions, with and without an overhung volute. The volute was found to severely harm aerodynamic stability of the investigated compressor when operating at lower than design mass flow. The relative narrowing effect of the volute on compressor map width increases with pressure ratio up to a 42 per cent drop in stable flow range at design speed. The inter-passage variations in performance quantities and the influence of the volute tongue region are discussed in detail. The circumferential variations of incidence angle correlate with rotational speed, which, in combination with the higher sensitivity to incidence angle at transonic inflow conditions, seems to deteriorates stability when transonic inflow conditions are reached.

show abstract

Section: Introductionmentioning

confidence: 99%

Influence of the volute on the flow in a centrifugal compressor of a high-pressure ratio turbocharger

Zheng

Huenteler

Yang

et al. 2010

Proceedings of the Institution of Mechanical Engineers, Part A:

View full text Add to dashboard Cite

show abstract

“…Then the data in the file is processed using the Fast Fourier Transformation Analysis (FFT) to estimate the Power Spectrum Density (PSD) by plotting the modified and averaged periodicity of the time-discrete signal vector. The surge point can be obtained using pressure spectrum (analyzing the pressure downstream of the compressor), the frequency peak which describes the surge was between 18 and 22 Hz [17]. Where  is flow coefficient = Q/2πb2r2U2,  is the pressure coefficient =2∆P/ρU2 2 .…”

Section: Experimental Workmentioning

confidence: 99%

“…Jaatinen et al [16] also mentioned that the radial gap ratio has an ideal value and if the radial gap ratio is less than this value, the harm of increased loss will exceed the benefit of reduced slip and blockage. Theoretical analysis was made [17] on a highpressure ratio centrifugal compressor has slotted in the diffuser passages, and the results show that when the mass flow rate decreased, there is flow separation at the angle of the distributor axis, which was eliminated by the slag of the slot length, which was 8-16% of the diffuser chord length, thus increasing the stable flow rate without a significant decrease in the compressor performance. The increasing tip clearance causes additional losses and lowers compressor stage efficiency, especially at higher mass flows [18,19].…”

Section: Introduction and Literature Reviewmentioning

confidence: 99%

Influence of the Volute Design Parameters on the Flow Phenomena and Performance of the Centrifugal Compressor

Hassan¹,

Hadidi²,

Tharwan³

2022

Preprint

View full text Add to dashboard Cite

Influence of the volute design parameters on the stable operating range and the performance of a centrifugal compressor was investigated experimentally for the following design conditions. The volute casing surface roughness was changed from 0 to 200 µm in five steps and tested. The axial distance between the casing and the diffuser cascades (clearance) was varied in five steps as C/b2 = 1.2, 2.4%, 3.6%, 4.8%, and 6% relative to the impeller exit width. The radial distance from the impeller blade exit to the diffuser vane inlet in (vaneless space radius) in six steps as C/r2 = 1.03, 1.05, 1.07, 1.09, 1.11, and 1. 13 relatives to the rotor outlet radius. The volute outlet geometry of a symmetric and tangent with different area ratios from 0.4 to 0.9. Finally, the compressor has been tested experimentally with different pinched vaned diffuser distances relative to the impeller exit width of bp/b2 =1, 0.98, 0.96, 0.94, 0.92, and 0.9. These testes were carried at different compressor operating conditions, and the time variations of the static pressure were recorded using five high-frequency response pressure transducers. A hot-wire anemometer is used to measure the compressor flow rate. The rotating stall and surge at the vaneless zone after the impeller exit can be detected by analyzing the fluctuations of pressure signals and the power spectrum density by using the Fast Fourier Transformation analysis. The experimental results indicated that the compressor with volute casing surface roughness of 100mm gives about 10.9% enhancements in the stable operating and 1% in pressure rise coefficient. The best axial distance between the diffuser vanes and the casing is 2.4% of the impeller blade height and the compressor in this design gives about 12.4% improvements in the stable working range. The compressor with radial vaneless distance of 1.056 gives improvements of about 16.6% in the surge margin, 2% in the pressure recovery and 4% in pressure rise coefficients. The compressor with a pinched diffuser of b/bp of 0.98 gives an improvement of 20.8% in surge point.

show abstract

“…53,54 Volute with tangential inlet gives a favorable performance when compared to symmetric volute. 55 Yang et al 56 suggested a design method to optimize the volute geometry of PAT to enhance its performance. Giosio et al 57 experimented on volute of a commercial PAT with the aim of modifying the inlet flow control.…”

Section: Effects Of Geometric Parameter On the Performance Of A Patmentioning

confidence: 99%

Geometrical effects on performance and inner flow characteristics of a pump-as-turbine: A review

Asomani

Yuan

Wang

et al. 2020

Advances in Mechanical Engineering

View full text Add to dashboard Cite

A pump-as-turbine is a hydraulic machine that can operate as a pump and turbine at the same time. Pump-as-turbine happens to be the most appropriate method for meeting the world’s energy demands, particularly in rural and isolated areas of a country. Furthermore, the operating cost of microhydropower systems is lower compared to conventional hydrodynamic turbines, but it requires high initial investment. Pump-as-turbine has been applied in many engineering fields such as irrigation, sewage, reverse osmosis, water distribution systems, farms, small pump storage power house, and pressure dropping valves. However, pump-as-turbine operates inefficiently at part-load due to lack of flow control device. In addition, the pump generates high flow instabilities in pump-as-turbine mode due to the shift of the best efficiency point toward higher head and discharge. This study extensively discusses the flow mechanism, modifications, and flow instabilities in the pump-as-turbine mode operation. First, the mechanism of the pump-as-turbine can be described as drawing out mechanical energy from the flow in the reverse mode. Since the energy drawn mainly depends on the major hydraulic components of the pump (impeller and volute), many studies have been conducted on the impeller and volute. It can be concluded that high amount of hydraulic losses is generated in pump-as-turbine mode operation. This can partly be attributed to the fixed geometrical parameters such as the stationary volute. To increase the usage of pump-as-turbine, it is very crucial to predict their performance in advance before manufacturing, which requires the understanding of the flow behavior as a result of geometrical parameters. In order to improve the energy conversion and understand the flow behavior in the centrifugal pump functioning as pump-as-turbine, the key geometrical parameters should be carefully designed. The designs of the main geometrical parameters do affect not only the hydraulic performance of pump-as-turbine but also the operational instability. The operational instability of hydraulic machines mainly depends on the pressure and the velocity fluctuation intensity generated within the flow passage as a result of the impeller–volute interaction. The magnitudes of the instabilities have the tendency to cause noise, vibration, harshness, and cavitation which reduces the life span of the hydraulic machine. Moreover, appropriate selection of the pump and unavailability of pump data contribute to the challenges faced. Finally, this review proposes specific solutions in terms of geometrical modifications and improvement of the computational design methods to handle the hydraulic losses faced during the pump operation; thus, this study can serve as a point of reference for a pump-as-turbine performance optimization.

show abstract

Influence of the volute design parameters on the performance of a centrifugal compressor of an aircraft turbocharger

Cited by 16 publications

References 4 publications

Influence of the volute on the flow in a centrifugal compressor of a high-pressure ratio turbocharger

Influence of the volute on the flow in a centrifugal compressor of a high-pressure ratio turbocharger

Influence of the Volute Design Parameters on the Flow Phenomena and Performance of the Centrifugal Compressor

Geometrical effects on performance and inner flow characteristics of a pump-as-turbine: A review

Contact Info

Product

Resources

About