Effect of blade squealer tips on aerodynamic performance and stall margin in a transonic centrifugal compressor with vaned diffuser

Zamiri, Ali; Choi, Minsuk; Chung, Jin Taek

doi:10.1016/j.ast.2022.107504

Cited by 13 publications

(3 citation statements)

References 35 publications

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“…The main reason was that the airflow deteriorated when the compressor was operated in the near-choke region compared to the high-efficiency region. While the rotational stall phenomenon occurred when the compressor was operated in the near-surge region [39,40], and the airflow turbulence intensity increased, which increased the compressor's aerodynamic noise emissions. Therefore, at the same speed, the compressor operating in the high-efficiency region could achieve lower aerodynamic noise emissions.…”

Section: Experimental Analysis Of Aerodynamic Noise Emission Characte...mentioning

confidence: 99%

Experimental and Mechanism Study of Aerodynamic Noise Emission Characteristics from a Turbocharger Compressor of Heavy-Duty Diesel Engine Based on Full Operating Range

Huang

Wang

et al. 2023

Sustainability

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Heavy-duty diesel engines equipped with turbochargers is an effective way to alleviate energy shortage and reduce gas emissions, but their compressor aerodynamic noise emissions have become an important issue that needs to be addressed urgently. Therefore, to study the aerodynamic noise emission characteristics of a compressor during the full operating range, experimental and numerical simulation methods were used to analyze the aerodynamic noise emissions. The results showed that aerodynamic noise’s total sound pressure level (SPL) increased with increased speed under the test conditions. At low speeds, the total SPL of aerodynamic noise was affected by the mass flow of the compressor more obviously. The maximum difference of aerodynamic noise total SPL was 1.55 dB at 60,000 r/min under different mass flows. At the same speed, the compressor could achieve lower aerodynamic noise emissions by operating in the high-efficiency region (middle mass flows). In the compressor aerodynamic noises, the blade passing frequency (BPF) noise played a dominant role. The transient acoustic-vibration spectral characteristics and fluctuation pressure analysis indicated that BPF and its harmonic frequency noises were mainly caused by the unsteady fluctuation pressure. As the speed increased, the BPF noise contributed more to the total SPL of the aerodynamic noise, and its percentage was up to 75.35%. The novelty of this study was the analysis of the relationship between compressor aerodynamic noise and internal flow characteristics at full operating conditions. It provided a theoretical basis for reducing the heavy-duty diesel engine turbocharger compressor aerodynamic noise emissions.

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Section: Experimental Analysis Of Aerodynamic Noise Emission Characte...mentioning

confidence: 99%

Experimental and Mechanism Study of Aerodynamic Noise Emission Characteristics from a Turbocharger Compressor of Heavy-Duty Diesel Engine Based on Full Operating Range

Huang

Wang

et al. 2023

Sustainability

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show abstract

“…The results showed that the shorter splitter and varied pitch fraction both increase near surge and peak efficiency. Zamiri et al [17] investigated the influences of blade squealer tips on the aerodynamic performance of a centrifugal compressor. The results showed that at the design point, the use of squealer tips increased the compressor efficiency by 0.32%.…”

Section: Introductionmentioning

confidence: 99%

Investigating a New Method-Based Internal Joint Operation Law for Optimizing the Performance of a Turbocharger Compressor

Huang

Fan

et al. 2023

Sustainability

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A well-matched relationship between the compressor and turbine plays an important role in improving turbocharger and engine performance. However, in the matching of turbocharger and engine, the internal operation relationship between compressor and turbine is not considered comprehensively. In order to fill this gap, this paper proposed the internal joint operation law (IJOL) method based on the internal operating characteristics of the compressor and turbine using a combination of experimental and simulation methods. On this basis, the optimization method of the compressor was proposed. Firstly, according to the basic conditions of turbocharger, the compressor power consumption and the turbine effective power at a fixed speed were solved. Secondly, the power consumption curve of the compressor and the effective power curve of the turbine were coupled to obtain the power balance point of the turbocharger. Then, the internal joint operating point was solved and coupled to obtain the IJOL method. Finally, the IJOL method was used to optimize the blade number and the blade tip profile of the compressor. The simulation results showed that for the blade number, the 8-blade compressor had the best overall performance. For the blade tip profile, compared with the original compressor, the surge performance of the impeller inlet diameter reduced by 3.12% was better than that of the original compressor. In addition, in order to compare this to engine performance with different compressor structures, a 1D engine model was constructed using GT-Power. The simulation results showed that the maximum torque of the engine corresponding to the impeller designed by the IJOL method was 4.2% higher than that of the original engine, and the minimum brake specific fuel consumption was 3.1% lower. Therefore, compared with the traditional method, the IJOL method was reasonable and practical.

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“…Compared with entropy production and dissipation functions, the total efficiency and total pressure loss mainly figured out the evaluation of the overall performance and could not disclose the specific loss location and loss accumulation process in the flow field. Meanwhile, entropy production can demonstrate the quantity and position of flow losses caused by heat exchange or viscosity, leading to the good applications in centrifugal compressors [17,18] and turbines [19,20]. However, for a low-speed viscous flow with negligible temperature change, the work performed by the viscous force is the only source of energy loss.…”

Section: Introductionmentioning

confidence: 99%

An Investigation on Optimized Performance of Voluteless Centrifugal Fans by a Class and Shape Transformation Function

Zhu,

Li,

et al. 2023

Processes

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Class and shape transformation functions are proposed to carry out the parametric design of the blade profiles because fan efficiency is closely related to the shape of blade profiles. An optimization with the objectives of fan efficiency and static pressure based on the Kriging models was established, and numerical simulation data were applied to construct the Kriging models. The dissipation function was used to analyze the fan energy loss. The prediction results show that the maximum accuracy error between the Kriging model and the experimental data is approximately 0.81%. Compared with the prototype fan, the optimized fan was able to ameliorate the distribution of the flow field pressure and velocity; the outlet static pressure increased by 9.03%, and the efficiency increased by 2.35%. The dissipation function is advantageous because it can intuitively indicate the location and amount of energy loss in the fan, while effectively obtaining the total energy loss as well. The situation of energy loss was mutually validated with the density of the static pressure contours and the streamline distribution. The flow fields at the leading edge of the optimized fans were improved by analysis of the dissipation function, and the leading edges of the three impellers selected from the Pareto front were narrower and flatter than those of the prototype fan.

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Effect of blade squealer tips on aerodynamic performance and stall margin in a transonic centrifugal compressor with vaned diffuser

Cited by 13 publications

References 35 publications

Experimental and Mechanism Study of Aerodynamic Noise Emission Characteristics from a Turbocharger Compressor of Heavy-Duty Diesel Engine Based on Full Operating Range

Experimental and Mechanism Study of Aerodynamic Noise Emission Characteristics from a Turbocharger Compressor of Heavy-Duty Diesel Engine Based on Full Operating Range

Investigating a New Method-Based Internal Joint Operation Law for Optimizing the Performance of a Turbocharger Compressor

An Investigation on Optimized Performance of Voluteless Centrifugal Fans by a Class and Shape Transformation Function

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