An aerodynamic investigation of a centrifugal compressor for HCFC123

Nakagawa, Koji; Tanaka, S.; Kaneko, Junichi

doi:10.1016/0140-7007(92)90050-5

Cited by 4 publications

(4 citation statements)

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“…In view of this, we begin our work with a brief survey on the limited publications [13][14][15][16][17][18][19], and some of the representative achievements in the related areas are discussed.…”

Section: Introductionmentioning

confidence: 99%

“…The preliminary success of the tandem-bladed configuration in the centrifugal compressor at NASA awakened further interest in tandem-blade technology in the following two decades, which was especially focused on the areas of gas turbine and refrigeration [14][15][16][17][18]. Among them were the detailed experimental investigations at the DLR, German Aerospace Center [17,18], where primary efforts were devoted to the performance characteristics and flowfields of the tandem-bladed impeller with adjustable geometries in a centrifugal compressor rig.…”

Section: Introductionmentioning

confidence: 99%

“…Over the years, extensive efforts have been devoted to innovative ideas of enhancing the compressor performance, whereby the concepts are essentially grouped into three categories: 1) vortex generators on the hub/shroud, or turbulence/acoustic/ plasma generators on the blade suction surface [3,4]; 2) boundarylayer suction or blowing on the blade suction surface, or on the hub/ shroud [5,6]; and 3) tandem blade or slot [7][8][9][10][11][12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

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Design Optimization and Experimental Study of Tandem Impeller for Centrifugal Compressor

Zhang

2014

Journal of Propulsion and Power

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Although significant advances have been made in tandem-blade technology for axial compressors, few efforts were devoted to its application in centrifugal compressors. Based on detailed computational fluid dynamics simulations and sensitivity analysis, multiobjective design optimization is conducted for a tandem impeller. An optimized tandem impeller, for which the objectives are all better than those of the baseline, is fabricated and tested on a high-speed centrifugal compressor rig. The numerical results show that the baseline tandem impeller has more uniform discharge flow but lower efficiency than the corresponding splitter impeller. The geometries of the inducer blade profile and inducer-exducer gap are found to have the greatest impact on the tandem impeller efficiencies. By optimization, the tandem impeller efficiency can be increased through reduced curvature of the blade profile at the inducer hub, S-shaped blade angle distribution at the inducer tip, and increased blade angle at the exducer tip near the leading edge. The measured performance of the centrifugal compressor with the optimized tandem impeller agrees well with the computational fluid dynamics calculations, and the compressor peak efficiency is 0.796 at the design speed (45,000 rpm). Nomenclature C p = total pressure loss coefficient (C p P t;3 − P t ∕P t;3 − P s;3 , three-diffuser inlet) H 11 ∼ H 14 = Bézier control points at the inducer hub side H 21 ∼ H 24 = Bézier control points at the exducer hub side m = meridional length, mm _ m = mass flow rate, kg∕s N = shaft speed, rpm P = pressure, Pa PS = pressure surface R = radius, mm SS = suction surface T = temperature, K T 11 ∼ T 14 = Bézier control points of the blade angle distribution at the inducer tip T 21 ∼ T 25 = Bézier control points of the blade angle distribution at the exducer tip V 1 ∼ V 5 = design variables y = nondimensional distance of the first node from the wall α = absolute flow velocity angle, deg β = blade angle from meridional plane, deg ε = total to total pressure ratio η = total to total polytropic efficiency θ = blade tangential coordinate, deg Subscripts des = design point value in = computational inlet section s = static value t = total value

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Design Optimization and Experimental Study of Tandem Impeller for Centrifugal Compressor

Zhang

2014

Journal of Propulsion and Power

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“…How to obtain the performance of the centrifugal compressor economically and accurately is attractive for researchers [8,9] when the working substance is real gas.…”

Section: Introductionmentioning

confidence: 99%

Performance Prediction of Centrifugal Compressor Based on Performance Test, Similarity Conversion and CFD Simulation

Zhu

Qin

2012

International Journal of Fluid Machinery and Systems

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One centrifugal compressor is applied for refrigeration and its working substance is R134a. The operating points obtained by using similar conversion at different rotation speeds are compared with the numerical results. They keep consistent with each other while the rotation speeds are lower, but the error between them will become large with the increasing of the rotation speed. Then the operating points are obtained when the working substance is air by using two similar conversion methods separately. Based on the comparison, it can be obtained that the result of keeping the specific volume ratio of inlet and outlet is more accurate than the result of maintaining Ma number. Then the test result is compared with the similarity result and the numerical result when the working substance is air. It is obtained that the similarity result is more consistent with the test result better than the numerical result and the trend of efficiency and pressure ratio change with the flow rate is consistent with the test result. In the process of similar conversion, the efficiency η is no useful for similitude design and it has less influence on the conversion result.

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