نتایج جستجو برای: swirl

تعداد نتایج: 1826  

2001
Bassem Ramadan

A computational study of a directinjection (DI) engine intake system using KIVA-3V was conducted. The engine considered had two intake ports designed to generate a swirling motion of the intake charge in the cylinder. To investigate the effect of adding shrouds to the intake valves on swirl, two sets of intake valves were considered; the first set consisted of conventional valves, and the secon...

2009
Mike Bergin Ettore Musu

Computational Fluid Dynamic (CFD) simulations using the AVL Fire and Kiva 3v codes were performed to examine commonly accepted techniques and assumptions used when simulating direct injection diesel engines. Simulations of a steady state impulse swirl meter validated the commonly used practice of evaluating the swirl ratio of diesel engines by integrating the valve flow and torque history over ...

2005
Kang-Ho Sohn Zvi Rusak Ashwani K. Kapila

The influence of swirl on the shape of the Burke-Schumann reaction sheet in a straight cylindrical pipe is investigated by asymptotic and numerical means. Attention is confined to swirl levels that are near the critical value at which vortex breakdown occurs. A high Reynolds number, laminar, isothermal, low Mach number reacting flow is considered. An asymptotic analysis is developed to study th...

2006
Manuel García-Villalba

The paper presents large eddy simulation of unconfined swirling jets. In the first part, an unconfined annular jet is investigated for swirl numbers ranging from 0 to 1.2. The impact of the swirl on the mean flow and the precessing vortex structures in this flow is analysed. In the second part of the paper, a co-annular pilot jet is introduced near the axis. The investigations show that the add...

Journal: :CoRR 2015
Peetak Mitra Niranjan Gudibande Kannan Iyer TI Eldho

Hydraulic Pump sumps are designed to provide a swirl free flow to the pump. The degree of swirl is measured in physical model tests using a swirl meter and a quantity known as swirl angle is generally measured. The present paper presents a novel method to compute the bulk swirl angle using the local velocity field obtained from computational fluid dynamics data. The basis for the present method...

2011
Nguyen Phi Long Y. Tanaka Y. Uesugi Y. Yamaguchi

and Swirl Gas Angle on Evaporation of Hafnium Cathode in a Plasma Cutting Arc Nguyen Phi Long1, Y. Tanaka1, Y. Uesugi1, and Y. Yamaguchi2 1Division of Electrical Engineering and Computer Science, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan 2Komatsu Industries Corporation, Japan Abstract: The effects of arc current and swirl gas angle on plasma cutting arc were investigated using a dev...

2003
S. K. Aggarwal T. W. Park

The effects of swirl and vaporization on droplet dispersion are investigated in the near region of a two-phase, swirling, heated jet. Simulations are based on the numerical solution of time-dependent, axisymmetric gas-phase equations.Droplets’ trajectories are tracked byusingaLagrangianapproach.Forall of the swirl cases investigated, the droplet dispersion exhibits a nonmonotonic behavior, with...

2009
Yehia A. Eldrainy Hossam S. Aly Mohammad Nazri Mohd Jaafar

The central recirculation zone (CRZ) in a swirl stabilized gas turbine combustor has a dominant effect on the fuel air mixing process and flame stability. Most of state of the art swirlers share one disadvantage; the fixed swirl number for the same swirler configuration. Thus, in a mathematical sense, Reynolds number becomes the sole parameter for controlling the flow characteristics inside the...

2007
Frank Sagona Doyle Dobson Mark Miller

Pollution reduction in the Conasauga River is a high priority for Georgia due to the remaining biological diversity of the Conasauga. Home to 76 native species of fish, more than the Columbia and Colorado Rivers combined, the Conasauga serves residential, agricultural, and carpet industry needs in and around Dalton. Segments of the river are impaired due to sediment, nutrients, and fecal colifo...

2012

The objective of this work is to investigate the turbulent reacting flow in a three dimensional combustor with emphasis on the effect of inlet swirl flow through a numerical simulation. Flow field is analyzed using the SIMPLE method which is known as stable as well as accurate in the combustion modeling, and the finite volume method is adopted in solving the radiative transfer equation. In this...

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