scholarly journals Sound radiated from low Mach number turbulent boundary layer flows（Turbulent boundary layer on a smooth plate and over a small forward facing step）

2021 ◽  
Vol 16 (2) ◽  
pp. JFST0010-JFST0010
Author(s):  
Shiko MORIYAMA ◽  
Yohei INOUE ◽  
Hiroshi MAEKAWA
Keyword(s):  
Boundary Layer ◽  
Mach Number ◽  
Turbulent Boundary Layer ◽  
Boundary Layer Flows ◽  
Low Mach Number ◽  
Forward Facing Step ◽  
Smooth Plate

Approximate Solution—One-Dimensional Energy Equation for Transient, Compressible, Low Mach Number Turbulent Boundary Layer Flows

1989 ◽  
Vol 111 (3) ◽  
pp. 619-624 ◽  
Author(s):  
J. Yang ◽  
J. K. Martin
Keyword(s):  
Boundary Layer ◽  
Mach Number ◽  
Turbulent Boundary Layer ◽  
Internal Combustion Engines ◽  
Energy Equation ◽  
Numerical Solutions ◽  
Empirical Relation ◽  
Approximate Solutions ◽  
Low Mach Number ◽  
One Dimensional

Unsteady surface heat-flux and temperature profiles in the transient, compressible, low Mach number, turbulent boundary layer typically found in internal combustion engines have been determined by numerically integrating a linearized form of the one-dimensional energy equation. An empirical relation for μt/μ has been used to consider turbulent conductivity. Approximate solutions have been acquired by multiparameter fits to the numerical solutions. Comparisons of the approximate solutions with motored engine experiments show good agreement.

Effects of Flexible Walls on Radiated Sound From a Turbulent Boundary Layer

2002 ◽  
Author(s):  
Z. Charlie Zheng
Keyword(s):  
Boundary Layer ◽  
Mach Number ◽  
Turbulent Boundary Layer ◽  
Sound Radiation ◽  
Low Frequencies ◽  
Low Mach Number ◽  
Wall Pressure Fluctuations ◽  
Flexible Wall ◽  
Flexible Walls ◽  
Radiated Sound

In this paper, radiated sound from low Mach number turbulent boundary layers is studied using Lighthill’s analogy. The focus is to investigate the behavior of wall pressure fluctuations on a flexible wall boundary. Comparisons are made between the results from rigid and flexible walls. At low frequencies, the flexible wall results have shown much higher levels of power spectra. At high frequencies, the spectra of the flexible wall sound radiation and those of the rigid wall sound radiation merge. These trends are in agreement with other experimental and theoretical results in literature. This theoretical study of the two-dimensional turbulent boundary layer can clarify the effects of a flexible wall on radiated sound in low Mach number flows.

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