Hydrodynamic Performance Analysis of Hubless Rim-Driven Propulsors

2012 ◽  
Vol 256-259 ◽  
pp. 2565-2568 ◽  
Author(s):  
Shuai Zhang ◽  
Xi Zhu ◽  
Zhen Long Zhou
Keyword(s):  
Performance Analysis ◽  
Thickness Distribution ◽  
Design Guidelines ◽  
Hydrodynamic Performance ◽  
Geometry Model ◽  
Blade Root ◽  
Root Strength ◽  
Blade Geometry

Due to no design guidelines available for the hubless propeller，based on the relative inflow velocities together with blade root strength considerations, the Ka –series propeller’s blade geometry was re-designed with an inversion of the thickness distribution of the sections. Accordingly，the blade geometry model for hubless rim-driven propulsors was designed，then three types of hubless rim-driven propulsors’ models were established and calculated numerically. The results show that thrust coefficients and torque coefficients for hubless rim-driven propulsors are similar to the ducted Propeller’s. Due to no hub, with the new thruster the hub-vortex is avoided and the cavitation minimized.

A CAD-Based Blade Geometry Model for Turbomachinery Aero Design Systems

2003 ◽  
Author(s):  
Ali Merchant ◽  
Robert Haimes
Keyword(s):  
Three Dimensional ◽  
Model Construction ◽  
Design System ◽  
Solid Model ◽  
Design Environment ◽  
Seamless Integration ◽  
Geometry Model ◽  
Design Systems ◽  
Blade Model ◽  
Blade Geometry

A CAD-centric approach for constructing and managing the blade geometry in turbomachinery aero design systems is presented in this paper. Central to the approach are a flexible CAD-based parametric blade model definition and a set of CAD-neutral interfaces which enable construction and manipulation of the blade solid model directly inside the CAD system’s geometry kernel. A bottleneck of transferring geometry data passively via a file-based method is thus eliminated, and a seamless integration between the CAD system, aero design system, and the larger design environment can be achieved. A single consistent CAD-based blade model is available at all stages of the aero design process, forming the basis for coupling the aero design system to the larger multi-disciplinary design environment. The blade model construction is fully parameterized so that geometry updates can be accurately controlled via parameter changes, and geometric sensitivities of the model can be easily calculated for multidisciplinary interaction and design optimization. A clear separation of the parameters that control the three-dimensional shape of the blade (such as lean and sweep) from the parameters that control the elemental profile shape allows any blade profile family or shape definition to be utilized. The blade model definition, construction interface, and implementation approach are described. Applications illustrating solid model construction, parametric modification and sensitivity calculation, which are key requirements for automated aerodynamic shape design, are presented.

Investigation on the Effects of Torque Converter Blade Thickness Based on FSI Simulation

2019 ◽  
Author(s):  
Cheng Liu ◽  
Meng Guo ◽  
Wei Wei ◽  
Qingdong Yan ◽  
Pengyu Li
Keyword(s):  
Transient Flow ◽  
Thickness Distribution ◽  
Structural Response ◽  
Torque Converter ◽  
Hydrodynamic Performance ◽  
Peak Efficiency ◽  
Structure Interaction ◽  
Flow Fluctuations ◽  
Blade Thickness ◽  
Positive Correlations

Abstract A lot of efforts were put into the design of torque converter blade angles and the analysis of transient flow behaviors; yet little is known about the influence of the blade thickness distribution on the performance or structural response of a torque converter. This study proposed a parameterized blade thickness design model and analyzed the effects of the blade thickness on hydrodynamic performance and structural response using fluid-structure interaction (FSI) models. Both one-way FSI model and two-way FSI model were built and evaluated against test data, and it was found that the transient two-way FSI model outperformed the steady-state FSI model in terms of both flow and structure simulations. It was found that the stall torque ratio and peak efficiency exhibited positive correlations with blade thicknesses, whereas the stall capacity constant was inversely related to blade thicknesses. Both numerical and experimental results suggested that the pump-turbine interaction induced serious flow fluctuations, and FSI simulations were required in the design process to avoid potential resonance.

The hydrodynamic performance analysis of a submarine with new pump-jet propulsor

2022 ◽  
Vol 245 ◽  
pp. 110542
Author(s):  
Xin-Ran Li ◽  
Yun Ding ◽  
Wen-Quan Wang
Keyword(s):  
Performance Analysis ◽  
Hydrodynamic Performance

Hydrocomp Design and Prediction of Hydrodynamic Performance of Propeller

2014 ◽  
Vol 641-642 ◽  
pp. 283-287
Author(s):  
Ai Feng Zhang ◽  
Tian Lei Zhang ◽  
Jiang Ming Ding ◽  
Jin Yang Liu
Keyword(s):  
High Speed ◽  
Large Scale ◽  
Hydrodynamic Performance ◽  
Geometry Model ◽  
Propeller Design ◽  
Design Software ◽  
And Performance ◽  
Propeller Geometry ◽  
Performance Research ◽  
Ship Propeller

With the continuous development of large-scale, high-speed ship, considering economy and security of the ship, propeller design and performance research are of importance. In this paper, the best propeller is obtained by using the propeller design software HydroComp PropExpert and HydroComp PropCAD. Propeller geometry model is generated by Solidworks. Applying computational fluid dynamics method (CFD), we can take numerical simulation for the flow around the propeller. Finally, with the help of the software ANSYS, hydrodynamic performance of the design propeller can be forecasted. The results from the calculation and analysis can provide some reference for engineering practical problems and theoretical study.

Influence of Stator Blade Geometry on Torque Converter Cavitation

2017 ◽  
Vol 140 (4) ◽  
Author(s):  
Cheng Liu ◽  
Wei Wei ◽  
Qingdong Yan ◽  
Brian K. Weaver ◽  
Houston G. Wood
Keyword(s):  
High Speed ◽  
Torque Converter ◽  
Operating Conditions ◽  
Hydrodynamic Performance ◽  
Speed Ratio ◽  
Capacity Loss ◽  
Wide Range ◽  
Stator Blade ◽  
Torque Converters ◽  
Blade Geometry

Cavitation in torque converters may cause degradation in hydrodynamic performance, severe noise, or even blade damage. Researches have highlighted that the stator is most susceptible to the occurrence of cavitation due to the combination of high flow velocities and high incidence angles. The objective of this study is to therefore investigate the effects of cavitation on hydrodynamic performance as well as the influence of stator blade geometry on cavitation. A steady-state homogeneous computational fluid dynamics (CFD) model was developed and validated against test data. It was found that cavitation brought severe capacity constant degradation under low-speed ratio (SR) operating conditions and vanished in high-speed ratio operating conditions. A design of experiments (DOE) study was performed to investigate the influence of stator design variables on cavitation over various operating conditions, and it was found that stator blade geometry had a significant effect on cavitation behavior. The results show that stator blade count and leaning angle are important variables in terms of capacity constant loss, torque ratio (TR) variance, and duration of cavitation. Large leaning angles are recommended due to their ability to increase the cavitation number in torque converters over a wide range of SRs, leading to less stall capacity loss as well as a shorter duration of cavitation. A reduced stator blade count is also suggested due to a reduced TR loss and capacity loss at stall.

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