scholarly journals Distribution Performance Analysis and Experimental Research on the Port Plate Pairs of Low Speed High Torque Seawater Hydraulic Motor

2019 ◽  
Vol 32 (1) ◽  
Author(s):  
Zhiqiang Wang ◽  
Shaofeng Wu ◽  
Dianrong Gao ◽  
Shuncai Wang
Keyword(s):  
Friction And Wear ◽  
Flow Distribution ◽  
Test System ◽  
Inlet Pressure ◽  
Leakage Flow ◽  
Distribution Characteristics ◽  
Hydraulic Motor ◽  
Low Speed ◽  
Rotating Speed ◽  
High Torque

AbstractThe current research of seawater hydraulic motor mainly focused on piston motor and vane motor, but seldom regarded low speed high torque seawater hydraulic motor. Low speed high torque seawater hydraulic motor as a kind of energy conversion device and actuator plays an important role in seawater hydraulic transmission system. However, the physical and chemical properties of seawater, such as low viscosity, high causticity and poor lubrication, result in numerous problems. In this paper, the flow distribution characteristics of port plate pairs for the seawater hydraulic motor are investigated, and the leakage flow and power loss models of port plate pairs are established. Numerical simulations are carried out to examine the effects of water film, inlet pressure and rotating speed on the pressure distribution and leakage flow. And the friction and wear tests of port plate pairs are also carried out. Moreover, the test system of the seawater hydraulic motor is constructed and the performance of prototype with no-load or loading is conducted. The results indicate that the clearance of port plate pairs and inlet pressure have a significant effect on distribution characteristics, but the effect of rotating speed is not very obvious. The experimental results show that the minimum error rate can be maintained within 0.3% by the proposed flow model and the counter materials of 316L against carbon-fiber-reinforced polyetheretherketone (CFRPEEK) are suitable for the port plate pairs of seawater hydraulic motor. Finally, based on the seawater hydraulic experiment platform, the volumetric efficiency of no-load and loading are obtained that the maximum can achieve 94.71% and 90.14%, respectively. This research work may improve the flow distribution performance, lubrication and the friction and wear properties, enhance energy converting efficiency of port plate pair and provide theoretical and technical support for the design of high-performance water hydraulic components.

Analysis and Numerical Simulation of Leakage Flow of Low Speed High Torque Water Hydraulic Motor’s Plain Flow Distribution Pair

2012 ◽  
Vol 233 ◽  
pp. 204-207 ◽  
Author(s):  
Zhi Qiang Wang ◽  
Dian Rong Gao ◽  
Jia Huan Fei
Keyword(s):  
Numerical Simulation ◽  
Flow Velocity ◽  
Flow Distribution ◽  
Maximum Flow ◽  
Leakage Flow ◽  
Hydraulic Motor ◽  
Low Speed ◽  
Water Hydraulic ◽  
The Relationship ◽  
Maximum Flow Velocity

In order to ensure volumetric efficiency of low-speed and heavy-torque water hydraulic motor, the relationship between leakage flow and clearance of motor’s plain flow distribution pair in which water is used as medium is analyzed, and it’s concluded that the clearance of port plate and rotor end should be controlled below 5μm. In addition, the port plate flow field was simulated by using CFD software, and got that the leakage flow of numerical simulation is greater than theoretical calculation, and the numerical simulation values are more credible. It is also found that the maximum flow velocity is 16 m/s when outer ring is working, and when inner ring is working the maximum flow velocity is 20 m/s.

Characterization and performance analysis of a new type of a high water-based hydraulic motor with a self-balanced distribution valve mode

2017 ◽  
Vol 231 (24) ◽  
pp. 4655-4669 ◽  
Author(s):  
Bingjing Qiu ◽  
Jiyun Zhao ◽  
Liang Zhao
Keyword(s):  
Flow Distribution ◽  
High Water ◽  
Test Method ◽  
Structure Parameters ◽  
Hydraulic Motor ◽  
Low Speed ◽  
Hydraulic Motors ◽  
Water Based ◽  
Balanced Distribution ◽  
High Torque

High water-based hydraulic motors (HWBHMs) with advantages including higher specific power and shorter acceleration and braking time can be used to directly drive loads. In particular, low speed and high torque high water-based hydraulic motors work well in limited space and for special applications (open flame areas). However, traditional structure and flow distribution mechanisms cause serious leakage and lower work efficiency for low speed and high torque high water-based hydraulic motors. Thus, a new structure and flow distribution mechanism with self-balanced distribution valve groups for a high water-based hydraulic motor need to be developed to work in high pressure, low speed, and high torque conditions. In this paper, a high water-based hydraulic motor was theoretically analyzed and the working principle behind a high water-based hydraulic motor was briefly introduced. Numerical simulations were performed to examine the effects of the distribution valve parameters on the distribution performance. An orthogonal test method was used to determine the optimized structure parameters. A simulation model of a high water-based hydraulic motor was established using the AMESim simulation method to validate the feasibility of the optimized structure parameters. This research has laid a foundation for the further development of a high water-based hydraulic motor with low speed and high torque.

scholarly journals On Scaling Method to Investigate High-Speed Over-Tip-Leakage Flow at Low-Speed Condition

2018 ◽  
Vol 140 (6) ◽  
Author(s):  
Hongmei Jiang ◽  
Li He ◽  
Qiang Zhang ◽  
Lipo Wang
Keyword(s):  
High Speed ◽  
Turbine Blades ◽  
Flow Distribution ◽  
Tip Clearance ◽  
Leakage Flow ◽  
Tip Leakage Flow ◽  
Scaling Method ◽  
Low Speed ◽  
Tip Leakage ◽  
Speed Condition

Modern high-pressure turbine blades operate at high-speed conditions. The over-tip-leakage (OTL) flow can be high-subsonic or even transonic. From the consideration of problem simplification and cost reduction, the OTL flow has been studied extensively in low-speed experiments. It has been assumed a redesigned low-speed blade profile with a matched blade loading should be sufficient to scale the high-speed OTL flow down to the low-speed condition. In this paper, the validity of this conventional scaling approach is computationally examined. The computational fluid dynamics (CFD) methodology was first validated by experimental data conducted in both high- and low-speed conditions. Detailed analyses on the OTL flows at high- and low-speed conditions indicate that, only matching the loading distribution with a redesigned blade cannot ensure the match of the aerodynamic performance at the low-speed condition with that at the high-speed condition. Specifically, the discrepancy in the peak tip leakage mass flux can be as high as 22%, and the total pressure loss at the low-speed condition is 6% higher than the high-speed case. An improved scaling method is proposed hereof. As an additional dimension variable, the tip clearance can also be “scaled” down from the high-speed to low-speed case to match the cross-tip pressure gradient between pressure and suction surfaces. The similarity in terms of the overall aerodynamic loss and local leakage flow distribution can be improved by adjusting the tip clearance, either uniformly or locally.

Theoretical and experimental studies on the steady-state performance of low-speed high-torque hydrostatic drives. Part 1: Modelling

2009 ◽  
Vol 223 (11) ◽  
pp. 2663-2674 ◽  
Author(s):  
S K Mandal ◽  
K Dasgupta ◽  
S Pan ◽  
A Chattopadhyay
Keyword(s):  
Steady State ◽  
Experimental Studies ◽  
Open Circuit ◽  
State Variables ◽  
Hydraulic Motor ◽  
Low Speed ◽  
Compression And Expansion ◽  
Loss Coefficients ◽  
High Torque ◽  
State Models

In this article the steady-state models of an open-circuit and a closed-circuit hydrostatic transmission (HST) drive have been developed to study their performances. A low-speed high-torque multi-stroke cam plate type radial piston motor is considered for both HST drives. Bondgraph simulation technique has been used to model the drives. The multi-bondgraph representation of the HST drives is presented; it takes into account the compression and expansion phases, which occur sequentially in the hydraulic motor. A reduced bondgraph model of the drives has been proposed, where various losses are lumped into suitable resistive elements. The relationships of the loss coefficients with other state variables, obtained from the reduced model, are identified through experimental investigation. The loss coefficients are found to have a non-linear relationship with the load torque and the supply flowrate. Using the characteristics of these loss coefficients, the steady-state performances of the hydrostatic drives are studied in Part 2 of this article (pg. 2675 of this issue).

scholarly journals On Scaling Method to Investigate High-Speed Over-Tip-Leakage Flow at Low-Speed Condition

2017 ◽  
Author(s):  
Hongmei Jiang ◽  
Li He ◽  
Qiang Zhang ◽  
Lipo Wang
Keyword(s):  
High Speed ◽  
Flow Distribution ◽  
Tip Clearance ◽  
Leakage Flow ◽  
Tip Leakage Flow ◽  
Scaling Method ◽  
Low Speed ◽  
Aerodynamic Loss ◽  
Tip Leakage ◽  
Speed Condition

Modern High Pressure Turbine (HPT) blades operate at high speed conditions. The Over-Tip-Leakage (OTL) flow, which plays a major role in the overall loss generation for HPT, can be high-subsonic or even transonic. In practice from the consideration of problem simplification and cost reduction, the OTL flow has been studied extensively in low speed experiments. It has been assumed a redesigned low speed blade profile with a matched blade loading should be sufficient to scale the high speed OTL flow down to the low speed condition. In this paper, the validity of this conventional scaling approach is computationally examined. The CFD methodology was firstly validated by experimental data conducted in both high and low speed conditions. Detailed analyses on the OTL flows at high and low speed conditions indicate that, only matching the loading distribution with a redesigned blade cannot ensure the match of the aerodynamic performance at the low speed condition with that at the high-speed condition. Specifically, the discrepancy in the peak tip leakage mass flux can be as high as 22.2%, and the total pressure loss at the low speed condition is 10.7% higher than the high speed case. An improved scaling method is proposed hereof. As an additional dimension variable, the tip clearance can also be “scaled” down from the high speed to low speed case to match the cross-tip pressure gradient between pressure and suction surfaces. The similarity in terms of the overall aerodynamic loss and local leakage flow distribution can be improved by adjusting the tip clearance, either uniformly or locally. The limitations of this proposed method are also addressed in this paper.

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