Torque converter turbine noise and cavitation noise over varying speed ratio

Walber, Chad

doi:10.37099/mtu.dc.etds/420

Cited by 2 publications

(3 citation statements)

References 17 publications

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“…The studies in [9][10][11][12] show that when cavitation occurs in the torque converter, it will produce a large number of cavitation bubbles, some of the cavitation bubbles will disappear and burst inside the torque converter, and some of the bubbles will flow away with the circulating fluid of the torque converter. This part of the bubbles will cause a change in the oil flow rate from the torque converter, so this paper proposes using the cavitation identification method based on the difference between the inlet and outlet flow rate of the torque converter.…”

Section: Cavitation Identification Methods Based On Flow Differencementioning

confidence: 99%

“…To optimize cavitation, Chad Michael Walber from Michigan Technological University fixed a sensor directly onto the impeller. He then used a microwave telemetry system to study the pressure of the blade and designed a notch in the form of the tail of the impeller to improve the cavitation phenomenon [11]. Liu Cheng, Wei Wei, and their colleagues from Beijing University of Technology in China conducted a transient analysis of two-phase flow using CFD.…”

Section: Introductionmentioning

confidence: 99%

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Identification and Optimization Study of Cavitation in High Power Torque Converter

Wang,

Xu,

Zhao

et al. 2024

Applied Sciences

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Aiming at the phenomenon that a high-power torque converter is susceptible to cavitation, which leads to performance degradation, first, a transient flow field model of the torque converter is established, and CFD simulation and experimental research on the torque converter are carried out to find out the speed ratio region where cavitation occurs in the torque converter as well as the rule of occurrence of cavitation, and then the cavitation identification method based on the difference between the inlet and outlet flow of the torque converter is proposed. Then, the transient flow process inside the torque converter is analyzed, and it is pointed out that the angle between the inlet angle of the stator and the outlet angle of the turbine of the torque converter, i.e., the fluid inflow injection deviation angle is an important factor affecting the cavitation phenomenon. By adjusting the key parameters of the stator blade bone line, the fluid inflow deviation angle of the torque converter stator is optimized, so that the speed ratio range of cavitation under large load conditions is greatly reduced from the original 0–0.5 (50%) to 0–0.15 (15%). Meanwhile, in terms of test performance, the nominal torque of the torque converter is greatly improved under the premise of ensuring that the performance is basically unchanged, in which the nominal torque of the test zero speed is increased by 28.7%, and the cavitation of the torque converter has been greatly improved.

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Section: Cavitation Identification Methods Based On Flow Differencementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Identification and Optimization Study of Cavitation in High Power Torque Converter

Wang,

Xu,

Zhao

et al. 2024

Applied Sciences

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“…利用无线信号传输技术对导轮叶片入口压力进行测试，结果显示在补偿压力低、泵轮转速高的情况下导轮内部压力降低，且出现较大波动，预示空化的发生。ROBINETTE 等 [5][6] 利用声学测量方法对一系列液力变矩器进行空化特性试验研究，对所得数据进行拟合，获得其尺寸、工况及性能指标对空化初生的影响，并拟合经验公式以供设计参考。 WALBER 等 [7][8] 利用声学法对空化噪音进行测量，建立声压预测经验公式以及噪音评价指标。日本九州大学 WATANABE 等 [9] 进行了液力变矩器空化的试验及仿真研究，建立了基于透明塑料液力变矩器的空化观测模型，利用高速相机对空化现象进行观测，并结合动态转矩测试证实空化诱发了高频扭振。 TSUTSUMI 等 [10] 利用计算流体动力学(Computational fluid dynamics, CFD)方法，建立了单流道稳态空化数值仿真模型，研究了不同补偿压力及工况下的空化特性。韩国的 JU 等 [11] 利用单流道稳态空化 CFD 模型研究了液力变矩器内空化特性随工况的变化规律，研究表明空化主要出现在导轮中，且低速比下能容特性恶化严重。目前国内液力变矩器空化研究正处于起步阶段，仅有极少量文献。太原科技大学的赵丽丽 [12] 建立了不含空化的液力变矩器全流道瞬态 CFD 计算模型，通过植入气泡，模拟液力变矩器内气泡破碎机理，计算气泡破裂高发区。这种方法没有考虑空化模型，仅能模拟单个气泡在液力变矩器内随主流的流动及破灭情况，无法获取空化初生条件、空化形态等信息。LIU 等 [13][14][15] [17]   [18] ，因此需要使用更精确的湍流模型来模拟空化湍流，LES 模型能够有效地捕捉空化过程的瞬态湍流特性 [19] ，因此，本文利用 LES 湍流模型与雷诺时均模型(Reynold-averaged Navier-stokes equation,…”

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Investigation on the Cavitation Characteristics of High Power-density Torque Converter

2020

Journal of Mechanical Engineering

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：High power-density torque converter is prone to cavitation due to high circular velocity and low local pressure, consequently leading to performance degradation. Both experimental and numerical studies are carried out on the cavitation phenomena in a torque converter. A series of hydraulic performance tests are performed under different wheel speeds and charging pressures to reveal the relation between cavitation and operating/charging conditions. A full wheel transient cavitation model based on Rayleigh-Plesset equation is built to capture the two-phase cavitating flows inside torque converter under variant operating conditions.The stress-blended eddy simulation (SBES) model is adopted to calculate the turbulent behavior inside the torque converter. Both experimental and numerical results revealed that cavitation might occur under high pump speed, low speed ratio and low charging pressure conditions, and the cavitation degree increased with a decreasing speed ratio. The worst-case-scenario for cavitation is the stall operating condition. Large amount of cavitation bubbles are generated in the stator domain, blocked the main circular flow and reduced the mass flow rate, resulting in capacity degradation as high as 31%. The full wheel transient cavitation model is able to predict the cavitating hydraulic performance precisely. By considering cavitation, the maximum prediction error for torque ratio, capacity factor and efficiency is reduced from 30% to 5%.

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Torque converter turbine noise and cavitation noise over varying speed ratio

Cited by 2 publications

References 17 publications

Identification and Optimization Study of Cavitation in High Power Torque Converter

Identification and Optimization Study of Cavitation in High Power Torque Converter

Investigation on the Cavitation Characteristics of High Power-density Torque Converter

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