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Numerical analysis of 3-D unsteady flow in a vaneless counter-rotating turbine

ZHAO Qingjun, WANG Huishe, ZHAO Xiaolu, XU Jianzhong

Frontiers in Energy 2007, Volume 1, Issue 3, Pages 352-358 doi: 10.1007/s11708-007-0053-3

Abstract: To reveal the unsteady flow characteristics of a vaneless counter-rotating turbine (VCRT), a three-dimensional, viscous, unsteady computational fluid dynamics (CFD) analysis was performed.The results show that unsteady simulation is superior to steady simulation because more flow characteristicsThe unsteady effects in upstream airfoil rows are weaker than those in downstream airfoil rows in the

Keywords： unsteady flow three-dimensional pressure distribution similar result unsteady simulation

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URANS simulation of the turbulent flow in tight lattice bundle

Yiqi YU, Yanhua YANG

Frontiers in Energy 2011, Volume 5, Issue 4, Pages 404-411 doi: 10.1007/s11708-011-0165-7

Abstract: Unsteady Reynolds averaged Navier Stokes (URANS) is a promising approach to achieve this goal.

Keywords： tight rod bundle flow structure unsteady Reynolds averaged Navier Stokes (URANS)

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Measurement and analysis of tip clearance unsteady flow spectrum in axial-flow fan rotor

LIU Bo, HOU Weimin, MA Changyou, WANG Yangang, ZHOU Qiang

Frontiers in Energy 2008, Volume 2, Issue 4, Pages 448-452 doi: 10.1007/s11708-008-0088-0

Abstract: The tip clearance unsteady flow development from the inlet to the outlet of an axial-flow rotor was revealedby analyzing pressure frequency spectrum acquired from measuring the unsteady pressure field of theThe experiment provides test basis for thoroughly understanding the tip clearance unsteady flow and building

Keywords： development endwall unsteady pressure pressure measurement experiment

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Effects of radiation and heat source/sink on unsteady MHD boundary layer flow and heat transfer over

Krishnendu Bhattacharyya

Frontiers of Chemical Science and Engineering 2011, Volume 5, Issue 3, Pages 376-384 doi: 10.1007/s11705-011-1121-0

Abstract: this paper, an investigation is made to study the effects of radiation and heat source/sink on the unsteady

Keywords： MHD boundary layer unsteady flow heat transfer thermal radiation heat source/sink shrinking sheet suction

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Thermodynamic models and energy distribution of single-phase heated surface in a boiler under unsteady

Xiyan GUO, Yongping YANG

Frontiers in Energy 2011, Volume 5, Issue 1, Pages 69-74 doi: 10.1007/s11708-010-0117-7

Abstract: A coal-fired power unit frequently operates under unsteady conditions; thus, in order to acquire scientific

Keywords： thermodynamic model energy distribution boiler unsteady conditions

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Numerical Simulation of Rotor/Stator Interaction in Turbomachinery by Use of a Disturbance Vortex Method

Chen Maozhang,Peng Bo

Strategic Study of CAE 2000, Volume 2, Issue 2, Pages 15-23

Abstract: This method has some obvious advantages in simulating unsteady flow in turbomachinery, such as understandable

To validate the computational method, the unsteady flows caused by rotor/stator interactionAnd unsteady velocity correlation parameters at several locations inside the passage were compared withFrom the simulation results it can seen that the disturbance vortex method still converges fast evenexpressed by an elliptic-type Laplace equation rather than a hyperbolic-type equation even the flow is unsteady

Keywords： turbomachinery rotor/stator interaction disturbance vortex method compressible flow unsteady flow

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Study on wave rotor refrigerators

Yuqiang DAI, Dapeng HU, Meixia DING

Frontiers of Chemical Science and Engineering 2009, Volume 3, Issue 1, Pages 83-87 doi: 10.1007/s11705-009-0075-y

Abstract: As a novel generation of a rotational gas wave machine, the wave rotor refrigerator (WRR) is an unsteadypaper, the working mechanism and refrigeration principle are investigated based on the one-dimensional unsteady

Keywords： wave rotor refrigeration unsteady flow theory wave diagram

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How far have we been? ―Summary of investigations on rotating cavity at IDG, RWTH Aachen University

Dieter BOHN, Jing REN,

Frontiers in Energy 2009, Volume 3, Issue 4, Pages 489-497 doi: 10.1007/s11708-009-0040-y

Abstract: Annular cavities are found inside rotor shafts of turbomachines with an axial or radial throughflow of cooling air, which influences the thermal efficiency and system reliability of the gas turbines. The flow and heat transfer phenomena in those cavities should be investigated in order to minimize the thermal load and guarantee the system reliability. An experimental rig is set up in the Institute of Steam and Gas Turbines, RWTH Aachen University, to analyze the flow structure inside the rotating cavity with an axial throughflow of cooling air. The corresponding 3D numerical investigation is conducted with the in-house flow solver CHTflow, in which the Coriolis force and the buoyancy force are implemented in the time-dependent Navier-Stokes equations. Both the experimental and numerical results show that the whole flow structure rotating slower than the cavity rotating speed. The flow passing the observation windows in the experimental and numerical results indicates the quite similar trajectories. The computed sequences and periods of the vortex flow structure correspond closely with those observed in the experiment. Furthermore, the numerical analysis reveals a flow pattern changing between single pair, double pair, and triple pair vortices. It is suggested that the vortices inside the cavity are created by the gravitational buoyancy force in the investigated case, while the number and strength of the vortices are controlled mainly by the Coriolis force.

Keywords： rotating cavity buoyancy unsteady flow

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Investigation of vortical flows over oscillating body using fast Lagrangian vortex method

Baoshan ZHU ,

Frontiers in Energy 2009, Volume 3, Issue 3, Pages 297-306 doi: 10.1007/s11708-009-0010-4

Abstract: A computational method facilitating long-time and high-resolution unsteady vortical flows is developedThe effectiveness of the present method is examined by comparing the numerical results of unsteady separated

Keywords： unsteady vortical flows fast vortex method vortex shedding rotational oscillation thin cambered blade

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Numerical analysis of aerodynamic noise radiated from cross flow fan

CHEN Anbang, LI Song, HUANG Dongtao

Frontiers in Energy 2008, Volume 2, Issue 4, Pages 443-447 doi: 10.1007/s11708-008-0063-9

Abstract: The flow field in a cross flow fan was simulated by solving the 2-D unsteady Reynolds-averaged Navier-Stokes

Keywords： predicted aerodynamic Williams-Hawkings calculated pressure aerodynamic performance unsteady Reynolds-averaged

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The extension of simulation —— from system simulation to domain simulation

28 Nov 2020

Keywords：仿真技术

Study and Application of Steady Flow and Unsteady Flow Mathematical Model for Canal Networks

Zhang Mingliang,Shen Yongming

Strategic Study of CAE 2007, Volume 9, Issue 8, Pages 92-96

Abstract:

Based on Preissmann implicit scheme for one-dimensional Saint-Venant Equation, the mathematical model for one- dimensional river networks and canal networks is developed and the key issues on the model are expatiated particularly in this paper. This model is applied to simulating the tree-type irrigation canal networks and complex looped canal networks. The results of levels and flows and discharge distribution between the branches agree with the data from Adlul. This model is a simple and practical tool for water resource regulation of irrigation canal networks and river networks. These results show the application value of this model is to set up ecological numerical model of water quality in river networks and canal networks.

Keywords： Preissmann implicit scheme canal networks and river networks discharge distribution water quality mode

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Development and Application of Simulation Technology

Wang Zicai

Strategic Study of CAE 2003, Volume 5, Issue 2, Pages 40-44

Abstract:

This paper discusses the developing process of simulation technology in view of its development, maturationThen this paper introduces the application of simulation technology in the fields of national economyFinally, this paper analyzes the level and status quo of home and overseas simulation technology, and

Keywords： simulation technology system simulation hardware in loop simulation distributed interactive simulation

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Numerical simulation of benzene transport in shoreline groundwater affected by tides under different

Frontiers of Environmental Science & Engineering 2022, Volume 16, Issue 5, doi: 10.1007/s11783-022-1540-9

Abstract:

● An approach for assessing the transport of benzene on the beach was proposed.

Keywords： Numerical simulation Benzene Transport and fate Shoreline Groundwater Tide

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Numerical simulation of micro scale flowing and boiling

Wen WANG, Rui ZHUAN,

Frontiers in Energy 2009, Volume 3, Issue 4, Pages 396-401 doi: 10.1007/s11708-009-0049-2

Abstract: Numerical simulations of flowing and boiling in micro channels are presented, including the modeling of bubble dynamics of nucleate boiling, and a description of the interface of two phases with the volume-of-fluid (VOF). The two calculated cases are compared with related experimental data in literature. Some simulated results are found corresponding well to the experimental data. The simulated results also show the details of 3-dimensional heat transfer and the flow in micro channels, which are helpful to the investigation of the mechanism of two-phase heat transfer and flow in micro channels.

Keywords： volume-of-fluid (VOF) micro channel nucleate boiling bubble dynamics simulation