Discharge characteristics in an IC engine inlet port and the dependency on geometrical parameters are examined for two valves having seat angles of 40 and 45 deg. The characteristics were established under steady-state conditions over a range of valve lifts up to L/D=0.25 and pressure differentials up to 100 mm H2O. The detailed boundary layer characteristics, indicating flow separation and reattachment on the valve seats, were established with the aid of heat transfer data using the transient liquid crystal technique. Details of the experimental methods for obtaining discharge coefficients and heat transfer coefficients are presented. The discharge and heat transfer data established the expected sequential progression, with lift through the four flow regimes for the valve with a 45 deg seat angle. For the valve with a 40 deg seat angle the four flow regimes were not present. The results demonstrate the extreme sensitivity of the valve flow and boundary layer state to small changes in valve geometry. [S0098-2202(00)00504-6]

Issue Section:
Technical Papers
Keywords:
internal combustion engines, valves, flow control, heat transfer, boundary layers, flow measurement
Topics:
Flow (Dynamics), Valves, Discharge coefficient, Heat transfer, Internal combustion engines
1.
Tanaka, K., 1929, “Airflow Through Suction Valve of Conical Seat,” Aeronautical Research Institute Report, Tokyo Imperial University, Part 1, p. 262;
2.
Part 2, p. 361.
1.
Kastner
,
L. J.
,
Williams
,
T. J.
, and
White
,
J. B.
,
1963
–1964, “
Poppet Inlet Valve Characteristics and their Influence on the Induction Process
,”
Proc. Inst. Mech. Eng.
,
178
, Part 1, No.
36
, pp.
955
–
975
.
2.
Vafidis, C., and Whitelaw, J. H., 1984, “Steady and Pulsating Air Flow Through a Stationary Intake Valve of a Reciprocating Engine,” Imperical College, Mech. Eng. Dept. Report, No. FS/84/04.
3.
Weclas
,
M.
,
Melling
,
A.
, and
Durst
,
F.
,
1998
, “
Flow Separation in the Inlet Valve Gap of Piston Engines
,”
Prog. Energy Combust. Sci.
,
24
, No.
3
, pp.
165
–
195
.
4.
Ireland P. T., 1987, “Internal Cooling of Turbine Blades,” D. Phil. thesis, University of Oxford, UK.
5.
Fukutani I., and Watanabe E., 1982, “Air Flow through Poppet Inlet Valves-Analysis of Static and Dynamic Flow Coefficients,” SAE Paper 820154, pp. 1–9.
6.
Bicen, A. F., and Whitelaw, J. H., 1983, “Steady and Unsteady Flow Through an Intake Valve,” Imperial College, Mech. Eng. Dept. Report, No. FS/83/11.
7.
Bicen A. F., Vafidis C., and Whitelaw J. H., 1984, “Steady and Unsteady Air Flow Through an Intake Valve of a Reciprocating Engine,” Proc. Symp. of Flows in IC Engines, pp. 47–55.
8.
Ho¨fler
,
T.
,
Pitcher
,
G.
, and
Wigley
,
G.
,
1993
, “
Comparison of Diesel Engine Inlet Valve Flows under Steady State and Motoring Conditions
,”
Proc. SPIE
,
2052
, pp.
737
–
744
.
9.
Baughn
,
J. W.
,
1995
, “
Liquid Crystal Methods for Studying Turbulent Heat Transfer
,”
Int. J. Heat Fluid Flow
,
16
, No.
5
, pp.
365
–
375
.
10.
Schultz, D. L., and Jones, T. V., 1973, “Heat Transfer Measurements in Short Duration Hypersonic Facilities,” AGARD Report AG-165.
11.
Wang Z., Ireland P. T., and Jones T. V., 1993, “An Advanced Method of Processing Liquid Crystal Video Signals from Transient Heat Transfer Experiments,” ASME Paper 93-GT-282, pp. 1–7.
12.
Heywood J. B., 1988, Internal Combustion Engine Fundamentals, McGraw-Hill, New York.
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