TY - JOUR
T1 - Measurement of Turbulence of Air Swirl in a 4-Stroke Cycle Engine Cylinder
AU - Hamamoto, Yoshisuke
AU - Tomita, Eiji
AU - Miwa, Hiroyoshi
N1 - Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 1987
Y1 - 1987
N2 - The turbulence of air swirl in the cylinder of a motored engine with a shrouded intake valve was measured with a hot-wire anemometer. In order to determine the turbulence characteristics such as turbulence intensity, integral time scale, etc., the flow velocity data were analyzed by the “stationary time average method” during a time interval of compression TDC±Δt/2. By changing the time interval Δt, different values of turbulence characteristics were obtained. It was made clear that the use of a finite time interval Δt meant the use of a high pass filter with a cut-off frequency of about 1/(2Δt). As the angular speed of swirl, Q, increased, the turbulence intensity, (λt)v, increased and the integral time scale, (Lt)v, and the micro time scale, (λt)v, decreased. Here, (λt)v, (Lt)v and (λt)v are spatial average values in a cylinder. Different correlations between (λt)v and Q were obtained in different intake valves.
AB - The turbulence of air swirl in the cylinder of a motored engine with a shrouded intake valve was measured with a hot-wire anemometer. In order to determine the turbulence characteristics such as turbulence intensity, integral time scale, etc., the flow velocity data were analyzed by the “stationary time average method” during a time interval of compression TDC±Δt/2. By changing the time interval Δt, different values of turbulence characteristics were obtained. It was made clear that the use of a finite time interval Δt meant the use of a high pass filter with a cut-off frequency of about 1/(2Δt). As the angular speed of swirl, Q, increased, the turbulence intensity, (λt)v, increased and the integral time scale, (Lt)v, and the micro time scale, (λt)v, decreased. Here, (λt)v, (Lt)v and (λt)v are spatial average values in a cylinder. Different correlations between (λt)v and Q were obtained in different intake valves.
KW - Air Swirl
KW - Internal Combustion Engine
KW - Turbulence
KW - Turbulent Flow Measurement
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U2 - 10.1299/kikaib.53.2226
DO - 10.1299/kikaib.53.2226
M3 - Article
AN - SCOPUS:0023382783
SN - 0387-5016
VL - 53
SP - 2226
EP - 2232
JO - Transactions of the Japan Society of Mechanical Engineers Series B
JF - Transactions of the Japan Society of Mechanical Engineers Series B
IS - 491
ER -