Thermal Design of High Pressure Ratio Turbocharger Compressor Wheels

Mukherjee, S. N.; Baker, Don

doi:10.4271/2002-01-0162

Cited by 9 publications

(6 citation statements)

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“…The maximum compressor pressure ratio which the impeller can bear would decrease if the effect of temperature on the ultimate tensile strength was considered. 2,3 Meanwhile, the heat transfer to the compressor from the high-temperature components has a negative effect on the non-adiabatic performance of compressors, with respect to the increase of required compression power as well as to the impeller temperature. [4][5][6] Romagnoli et al 7 studied this effect by experiments on a turbocharger and found that the deterioration of the compressor non-adiabatic efficiency is severe over the whole range of test conditions.…”

Section: Introductionmentioning

confidence: 99%

Performance improvement of a high pressure ratio centrifugal compressor by integrated cooling

Moosania

Zheng

2016

Proceedings of the Institution of Mechanical Engineers, Part G:

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Centrifugal compressors with high pressure ratio have been widely used in small gas turbines, industrial compressors and turbochargers. High mechanical stress and high temperature of the impeller and large compression power required are the key factors that limit the pressure ratio achieved by centrifugal compressors. Cooling is an effective way to reduce the required compression power and the impeller temperature and it is widely used in gas turbines and industrial compressors. In this work, a cooling method named integrated cooling was employed in a high pressure ratio centrifugal compressor. The effects of the integrated cooling on the compressor performance were studied by three-dimensional steady simulation with conjugate heat transfer method using ANSYS CFX commercial solver. It is found that integrated cooling is capable of improving the compressor performance with respect to pressure ratio, efficiency, compression power as well as the impeller maximum temperature. With a cooling temperature of 300 K, the pressure ratio increased by 11.0% and efficiency by about 2.44% at the design condition. Besides, the maximum impeller temperature decreased by about 67 K. This considerable improvement of the compressor performance justifies the integrated cooling, which helps to advance the design of high pressure ratio centrifugal compressors.

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Section: Introductionmentioning

confidence: 99%

Performance improvement of a high pressure ratio centrifugal compressor by integrated cooling

Moosania

Zheng

2016

Proceedings of the Institution of Mechanical Engineers, Part G:

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“…Schilhansl 2 analyzed the stresses of a radial-flow rotor in the 1960s. For the influence of the thermal load, Mukherjee et al 3 used the heat transfer coefficients derived from the experiment as boundary conditions and analyzed the stresses of a radial-flow rotor at pressure ratio 4:1, and found that the thermal load has a significant contribution to the total stress. Zheng et al 4 used a solid-fluid coupling method and analyzed the stresses of a radial-flow rotor under several pressure ratios, and found that the aerodynamic load has little effect on the total stress and the effect of thermal load must be considered at high pressure ratio while it can be ignored at low pressure ratio.…”

Section: Introductionmentioning

confidence: 99%

“…The results from Vullo et al 5 showed that with an increasing temperature distribution along the radius of a rotating annular conical disk, the tangential stress component of the disk increases at inner part while decreases at the outer part, which is described in detail in Vullo and Vivio. 6 Most of the previous researches are conducted on centrifugal impellers [1][2][3][4]7 or single-stage axial rotors. 8,9 Few research works are about the stress analysis of the multistage axial compressor rotors, especially under real working conditions with the entire three kinds of loads: the centrifugal load, thermal load, and aerodynamic load.…”

Section: Introductionmentioning

confidence: 99%

Influence of different loads on the stresses of multistage axial compressor rotors

Zheng

Ding

Zhang

2016

Proceedings of the Institution of Mechanical Engineers, Part G:

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Multistage axial compressors are widely used in the gas turbine engines. The strength of rotors is one of the key factors for the reliability of multistage axial compressors. The stresses of rotors at real working conditions can be caused by the centrifugal load, thermal load, and aerodynamic load. It is important to figure out the roles and the mechanism of the three kinds of loads in the stresses generating process. In this paper, the stresses of rotors in a typical five-stage axial compressor are calculated with different kinds of loads by solid-fluid coupling method. The results show that the proportion of the stress caused by centrifugal load is more than 80% of the total stress, which is dominant. The maximum proportion of the stress caused by thermal load is about 20% of the total stress at the front stages. However, the influence of thermal load is quite different from the first stage to the last stage. It is surprising that thermal load can decrease the stresses of the last stage rotor, which is mainly because of the variation of radial temperature gradient at disks for different stages. The proportion of the stress caused by aerodynamic load is usually less than 4%, and it tends to make the stresses at the suction side of the blades lower and enlarge it at the pressure side. According to the above results, centrifugal load is necessary of consideration at the conceptual design phase for the multistage axial compressor rotors. At preliminary three-dimensional design phase, centrifugal load and thermal load should be considered together. At optimized three-dimensional design phase, aerodynamic load cannot be neglected and all the three loads should be considered.

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“…This is necessary when high compressor pressure ratios (of the order of 4:1 and higher) are needed, resulting in high tip speeds, thus causing the wheel to have high temperatures near the exducer (outlet) of the wheel and high stresses [4].…”

Section: Introductionmentioning

confidence: 99%

Experimental Analysis of Turbocharger Maximum Speed Using Different Materials for Compressor Impeller

Bassetti¹

2014

Blucher Engineering Proceedings

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Modern diesel engines for vehicular applications such as buses and other commercial vehicles are increasingly using technological resources in order to meet the pollutant emissions regulations. Among these features, the turbocharger fulfills an essential function of providing a higher air flow to the engine intake, providing a cleaner and more efficient combustion.During the application process of a turbocharger, calculations are performed to estimate the life of the compressor impeller, which takes into account the maximum shaft speed and the number of cycles that cause fatigue damage. Among these parameters, the maximum speed affects directly in the fatigue life of the impeller. Due to the different material options for the compressor impeller, the mass properties of each type of rotor may result in differences in their inertias thus impacting the maximum speed and the fatigue life calculation.The objective of this study is to provide a comparison of inertias influence for two choices of materials and check the maximum speed behavior with the variation of altitude during experimental tests. The experimental data were gathered in a delivery truck with a GVW of 8 tons, equipped with 4-cylinder engine, while traveling on a route from Guarulhos (ca. 650m alt.) up to Campos de Jordao (ca. 1700m alt.) in the state of Sao Paulo, Brazil.

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Thermal Design of High Pressure Ratio Turbocharger Compressor Wheels

Cited by 9 publications

References 0 publications

Performance improvement of a high pressure ratio centrifugal compressor by integrated cooling

Performance improvement of a high pressure ratio centrifugal compressor by integrated cooling

Influence of different loads on the stresses of multistage axial compressor rotors

Experimental Analysis of Turbocharger Maximum Speed Using Different Materials for Compressor Impeller

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