Numerical study on the Effect of Interaction Vaned Diffuser with Impeller on the Performance of a Modified Centrifugal Compressor

Jawad, Layth H.; Abdullah, Shahrum; Zulkifli, Rozli; Mahmood, Wan Mohd Faizal Wan

doi:10.1017/jmech.2013.49

Cited by 8 publications

(8 citation statements)

References 14 publications

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“…Prediction of the performance of turbomachinery is an important step in the design process for many applications [1][2][3]. For aviation industry, fuel economy is an important objective.…”

Section: Introductionmentioning

confidence: 99%

Computational Prediction of the Performance Map of a Transonic Axial Flow Compressor

Idres

Azmi

2022

CFDL

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Aviation fuel efficiency is an important target for aviation industry. Aircraft engine compression ratio is a key factor to improve fuel consumption. Compression ratio can be increased using transonic compressor. In this study, performance prediction of a transonic axial compressor at design and off-design operating conditions is investigated numerically using ANSYS-CFX software. The compressor is NASA Rotor 37. Firstly, the performance at design point is predicted, where mesh independence study is performed to determine suitable mesh size. Three-dimensional flow details for meridional plane, blade-to-blade plane and airfoil surface are explored. The design point study successfully captured flow features such as shock waves and flow separation regions. When compared with experimental data, the predicted compressor pressure ratio deviation error is less than 5%. 3D flow details show that shock wave strength increases from hub to tip. The shock wave moves backward as we move from hub to tip indicating that the flow separation covers lesser portion of the blade. Secondly, off-design performance is predicted for various rotational speeds. A simple procedure is utilized to predict surge and choke limits. The predicted compressor map is compared with experimental data and it shows overall root mean square error less than 5%. The success of the method developed in this research make it a viable method to be used in the design phase of transonic compressors to evaluate the effect of design modifications for both design and off-design operating conditions.

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“…Prediction of the performance of turbomachinery is an important step in the design process for many applications [1][2][3]. For aviation industry, fuel economy is an important objective.…”

Section: Introductionmentioning

confidence: 99%

Computational Prediction of the Performance Map of a Transonic Axial Flow Compressor

Idres

Azmi

2022

CFDL

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“…Compressor with vaned diffuser application can achieved of about 4% peak efficiency over the vaneless configuration 22) . Several other researchers have evaluated and developed centrifugal compressors vaned diffuser experimentally and numerically 23,24) Hence, the present study used a vaned diffuser turbocharger compressor to assess CNGDI engine performance using metrics like brake torque, thermal efficiency, volumetric efficiency and brake specific fuel consumption. Several SOI timings were evaluated to measure the increase in engine performance.…”

Section: Introductionmentioning

confidence: 99%

CNGDI Engine Performance Using a Vaned Diffuser Turbocharger Compressor with Varying Injection Timings

Amiruddin¹,

Mahmood²,

Abdullah³

et al. 2021

Evergreen

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The present paper assesses the empirical performance of a four-cylinder CNGDI engine with a vaned diffuser turbocharger compressor. This evaluation was performed to compare injection timing operating characteristics of engines coupled with vaneless and vaned diffuser turbocharger. Numerous start of injection (SOI) have been investigated, ranging from advanced SOI (300°CA to 180°CA bTDC) during the intake stroke to retarded SOI (180°CA to 120°CA bTDC) during the compression stroke. This experiment was conducted at a wide-open throttle (WOT) condition and the air fuel ratio is set at a stoichiometric condition. Study outcomes indicate that the vaned turbocharger increases boost pressure by an average of 50% compared to the vaneless variant. In comparison, a CNGDI engine equipped with a vaned diffuser turbocharger compressor increased brake torque by 3.66%, brake thermal efficiency (BTE) by 12.90% and volumetric efficiency by 4.75% when compared to a vaneless variant. Furthermore, a comparison of vaneless and vaned turbochargers indicates that brake specific fuel consumption (BSFC) reduced by 9.43%.

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“…With pressure increased, density of gas phase is significantly increased by nearly 20 times. Jawad et al, [13] studied the performance prediction of a modified centrifugal compressor used in turbo charger numerically. The researchers aimed to study and simulate the effect of impeller trimming on the performance of a turbocharger compressor.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Studies of Two-Phase Flow in Ribbed Periodic Vertical Channel

Habeeb¹,

Majdi²

2020

ARFMTS

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Pressure drop in a ribbed vertical channel was studied for a two-phase (air and water) flow, different shapes of ribs (triangle, semi-circular, and rectangle) were used in this investigation. An experimental rig was constructed with a test channel having the dimensions (10×3×70 cm) that enabled the flow patterns visual observation. An experimental setup of a two-phase was done for the present investigation, as well as a sum of (150) two-phase data with various flow patterns was determined. The used water superficial inlet velocities were in the range (0.0333-0.0888 m/s), and the air superficial inlet velocities were in the range (0.0555-0.1666 m/s). The experimental pressure drop according to a smooth plate was (41%, 38%, and 35%) for a channel fitted with semicircle , rectangular and triangular ribs, respectively. The less pressure drop recorded was in the triangular ribbed channel, which indicates that the triangular shaped ribbed channel is the finest shape among the studied ones to lower the pressure drop. As future work, the numbers and dimensions of ribs can be changed to investigate its effect on the two-phase flow and the pressure drop, another suggestion for the future investigations is to include other fluid to have a three-phase flow, also the inclination angle of the duct can be changed to study its effect.

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Numerical study on the Effect of Interaction Vaned Diffuser with Impeller on the Performance of a Modified Centrifugal Compressor

Cited by 8 publications

References 14 publications

Computational Prediction of the Performance Map of a Transonic Axial Flow Compressor

Computational Prediction of the Performance Map of a Transonic Axial Flow Compressor

CNGDI Engine Performance Using a Vaned Diffuser Turbocharger Compressor with Varying Injection Timings

Experimental and Numerical Studies of Two-Phase Flow in Ribbed Periodic Vertical Channel

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