First attempt to determine the critical inlet pressure for aircraft pumps with a numerical approach that considers vapor cavitation and air aeration

Dong, Hongkang; Wang, Yan; Chen, Jinhua

doi:10.1177/0954410020921302

Cited by 6 publications

(5 citation statements)

References 23 publications

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“…The second direction of the research is in increasing the pressure of the suction chamber of the hydraulic pump by the means of an auxiliary pressure booster, which is considered to be the most effective method [17,18]. A kind of piston pump with an integrated centrifugal impeller has made a major breakthrough in aviation applications [19,20], such as the high-speed piston pump (V30G) generated by the German company InLine; Bosch Rexroth (A15VLO) and Danfoss Hydraulic (D1P) have also offered similar products.…”

Section: Suction Capacity Of Cigpsmentioning

confidence: 99%

Numerical Investigation on Pairing Solutions of Non-Positive Displacement Pumps and Internal Gear Pump for High-Speed Design

Sun

Yang

et al. 2023

Fluids

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Raising the working speed of hydraulic pumps to maximize the efficient matching range of electric motors is one of the possible ways to achieve energy efficiency in electric machinery. By means of a simulation method verified with subsequent experiments in terms of filling efficiency, this paper first analyzed the suction capacity of crescent-type internal gear pumps with different geometric parameters at high speed, and the gear pair that is more suitable for high-speed operation was obtained. Subsequently, as the more significant contributions, two pairing solutions of a non-positive displacement pump and an internal gear pump were proposed to pressurize the inlet of the gear pump to keep it from cavitating. In the compact design solution, the inclined-holes type and axial-flow blade pumps share the same speed as the hydraulic pump, while the decentralized layout solution allows for flexible adjustment of the centrifugal impeller-type pump speed to maximize the filling capability. The final simulation results show that, with the help of inclined-holes type and centrifugal impeller type pumps, the filling efficiency of the internal gear pump at 6000 rpm can be improved by 3.59% and 5.84%, respectively, while the axial-flow blades pump fails to eliminate cavitation regardless of speed. Moreover, when the hydraulic pump works at 6000 rpm, the centrifugal impeller speed needs to be set above 2500 rpm to make sense.

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Section: Suction Capacity Of Cigpsmentioning

confidence: 99%

Numerical Investigation on Pairing Solutions of Non-Positive Displacement Pumps and Internal Gear Pump for High-Speed Design

Sun

Yang

et al. 2023

Fluids

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“…where D d is the diffusivity of dissolved gas mass fraction, s is the gas absorption or release time. The equilibrium gas mass fraction f d,eq is evaluated by Henry's law as shown in equation (7).…”

Section: Cfd Modelmentioning

confidence: 99%

“…Cavitation is regarded as a serious threat to the efficiency and reliability of axial piston pumps, especially in the field of aerospace applications, 6,7 leading to declined delivery flow, 8 increased vibration and noise levels, 9 and erosion damage. 10 The cavitation in hydraulic systems can be divided into gaseous cavitation and vaporous cavitation according to the formation mechanism of bubbles.…”

Section: Introductionmentioning

confidence: 99%

“…4 In addition, wide temperature range is another extreme operating condition for the aviation axial piston pump. In aerospace applications, the normal fluid temperature (at the pump inlet port) can be varied from À54 C to 135 C. 4,5 Cavitation is regarded as a serious threat to the efficiency and reliability of axial piston pumps, especially in the field of aerospace applications, 6,7 leading to declined delivery flow, 8 increased vibration and noise levels, 9 and erosion damage. 10 The cavitation in hydraulic systems can be divided into gaseous cavitation and vaporous cavitation according to the formation mechanism of bubbles.…”

Section: Introductionmentioning

confidence: 99%

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Cavitation in a high-speed aviation axial piston pump over a wide range of fluid temperatures

Chao

Tao

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part A:

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The axial piston pump in aerospace applications needs to operate over a wide range of fluid temperatures from −54°C to 135 °C. The fluid properties at such extreme temperatures will significantly affect the cavitation that is one of the major limiting factors for the efficiency and reliability of aviation axial piston pumps. However, it appears that very little of the existing literature studies the effects of extreme fluid temperatures on the pump cavitation. This paper aims to examine the temperature effects on the cavitation in an aviation axial piston pump. First, we develop a three-dimensional (3D) transient computational fluid dynamics (CFD) model to investigate the pump cavitation and validate it experimentally. Second, we use the validated CFD model to investigate the temperature effects on the pump cavitation by changing the fluid properties including viscosity, density, and bulk modulus. The numerical results show that low fluid temperature makes the aviation axial piston pump suffer serious cavitation due to high viscosity, leading to delivery flow breakdown, unacceptable pressure pulsation, and delayed pressure built up. In contrast, high fluid temperatures have minor effects on the cavitation although they increase the pressure pulsation and built-up time slightly.

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“…A full CFD model is developed from the fluid compressibility, gaseous dynamics, and cavitation damage [24]. The vapor cavitation [25] based CFD model is presented to identify the critical inlet pressure [26]. Apart from the CFD model, an analytical cavitation model is used to determine the pump's speed limitations [27].…”

Section: Introductionmentioning

confidence: 99%

Modelling and Fault Detection for Specific Cavitation Damage Based on the Discharge Pressure of Axial Piston Pumps

Xia

Xiang

2022

Mathematics

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Cavitation will increase the leakage and discharge pressure fluctuation of axial piston pumps. In particular, specific cavitation damage may aggravate the pressure impact and performance degradation. The influence of the specific cavitation damage on the discharge pressure is unclear, and the need for fault detection of this damage is urgent. In this paper, we propose a discharge pressure-based model and fault detection methodology for the specific cavitation damage of axial piston pumps. The discharge pressure model with specific damage is constructed using a slender hole. The simulation model is solved through numerical integration. Experimental investigation of cavitation damage detection is carried out. Discharge pressure features in the time domain and frequency domain are compared. The results show that waveform distortions, spectrum energy relocation, generation of new frequencies and sidebands can be used as features for fault detection regarding the specific cavitation damage of axial piston pumps.

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First attempt to determine the critical inlet pressure for aircraft pumps with a numerical approach that considers vapor cavitation and air aeration

Cited by 6 publications

References 23 publications

Numerical Investigation on Pairing Solutions of Non-Positive Displacement Pumps and Internal Gear Pump for High-Speed Design

Numerical Investigation on Pairing Solutions of Non-Positive Displacement Pumps and Internal Gear Pump for High-Speed Design

Cavitation in a high-speed aviation axial piston pump over a wide range of fluid temperatures

Modelling and Fault Detection for Specific Cavitation Damage Based on the Discharge Pressure of Axial Piston Pumps

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