Experimental and theoretical investigations of turbulent flow in a side-inlet rectangular conbustor

The report deals with investigations on large turbine bearings, a tilting pad bearing, and an elliptical bearing. In special cases, the maximum babbitt temperatures show a sudden leap, caused by a slight change of the operating conditions. According to the test results, the temperatures do not change within the whole bearing, but only in a region near the minimum gap width. As proved by comparative theoretical investigations, the reason for this temperature leap is a local transition between laminar and turbulent flow, changing the thermal conductivity within the oil film to a high degree. Thus, the consideration of thermal diffusion in the energy equation is essential for precalculating this phenomenon. As a consequence of locally high surface temperatures, considerably large thermoelastic deformations are observed at both test bearings. For this reason the comparative calculations are based upon measured gap width profiles.

Download Full-text

A novel laboratory pushing the limits for optics-based basic turbulence investigations

14th International Symposium on Particle Image Velocimetry ◽

10.18409/ispiv.v1i1.137 ◽

2021 ◽

Vol 1 (1) ◽

Author(s):

Simon Lautrup Ribergaard ◽

Yisheng Zhang ◽

Haim Abitan ◽

Jakob Skov Nielsen ◽

Niels Steenfeldt Jensen ◽

...

Keyword(s):

Turbulent Flow ◽

Mechanical Engineering ◽

Intermediate Scale ◽

Experimental Strategy ◽

Current State ◽

Theoretical Investigations ◽

Scale Turbulence ◽

Underlying Processes ◽

Objective Being ◽

Respective State

Developments in theoretical investigations and experimental techniques are reaching a level of maturity for which it is finally becoming possible to answer some of the most pressing questions in turbulence. The prevailing classical theories all have their strengths and drawbacks based on their respective principal assumptions. To better understand the implications of these assumptions, we have developed a theoryintensive experimental strategy. For these purposes, a laboratory has been established at the Department of Mechanical Engineering, Technical University of Denmark. The objective being to provide the data necessary to test the (bounds of) validity of the existing theories; Most prominently the classical Richardson-Kolmogorov-Batchelor paradigm, but also other generally adopted views such as Rapid Distortion Theory and Equilibrium Similarity. The measurements will be analyzed within a novel theoretical framework that enables not only quantification of the degree to which the small and intermediate scale turbulence behaves according to the existing theories (and their central assumptions), but also unveiling the underlying processes that create the respective state of turbulent flow. The present work will describe the current state of the developments of building up the laboratory.

Download Full-text

An Introduction to Turbulent Flow

10.1017/cbo9781316529850 ◽

2000 ◽

Cited By ~ 177

Author(s):

Jean Mathieu ◽

Julian Scott

Keyword(s):

Turbulent Flow

Download Full-text

Experimental and theoretical investigations concerning the magnetooptic effects in special D-type fibres

Journal de Physique IV (Proceedings) ◽

10.1051/jp4:2005129018 ◽

2005 ◽

Vol 129 ◽

pp. 85-90 ◽

Cited By ~ 3

Author(s):

K. Barczak ◽

T. Pustelny ◽

A. Szpakowski ◽

M. Błahut

Keyword(s):

Theoretical Investigations

Download Full-text

Modal Analysis of Turbulent Flow near an Inclined Bank–Longitudinal Structure Junction

Journal of Hydraulic Engineering ◽

10.1061/(asce)hy.1943-7900.0001856 ◽

2021 ◽

Vol 147 (3) ◽

pp. 04020100

Author(s):

Nasser Heydari ◽

Panayiotis Diplas ◽

J. Nathan Kutz ◽

Soheil Sadeghi Eshkevari

Keyword(s):

Turbulent Flow ◽

Modal Analysis ◽

Longitudinal Structure

Download Full-text

Numerical simulation of subsonic turbulent flow of oscillating NACA 0015 airfoi

Applied Questions of Mathematical Modeling ◽

10.32782/2618-0340-2018-2-133-145 ◽

2018 ◽

Vol 2 ◽

pp. 133-145

Author(s):

D.O. Redchyts ◽

◽

S.V. Moiseenko ◽

Keyword(s):

Numerical Simulation ◽

Turbulent Flow ◽

Naca 0015

Download Full-text

Theoretical and experimental research on slip and uplift of the timber-concrete composite beam

BioResources ◽

10.15376/biores.15.3.7079-7099 ◽

2020 ◽

Vol 15 (3) ◽

pp. 7079-7099

Author(s):

Jianying Chen ◽

Guojing He ◽

Xiaodong (Alice) Wang ◽

Jiejun Wang ◽

Jin Yi ◽

...

Keyword(s):

Differential Equations ◽

Deformation Theory ◽

Concrete Slab ◽

Theoretical Calculations ◽

Structural Element ◽

Structural Efficiency ◽

Theoretical Investigations ◽

New Type ◽

Interlayer Slip ◽

Good Agreement

Timber-concrete composite beams are a new type of structural element that is environmentally friendly. The structural efficiency of this kind of beam highly depends on the stiffness of the interlayer connection. The structural efficiency of the composite was evaluated by experimental and theoretical investigations performed on the relative horizontal slip and vertical uplift along the interlayer between composite’s timber and concrete slab. Differential equations were established based on a theoretical analysis of combination effects of interlayer slip and vertical uplift, by using deformation theory of elastics. Subsequently, the differential equations were solved and the magnitude of uplift force at the interlayer was obtained. It was concluded that the theoretical calculations were in good agreement with the results of experimentation.

Download Full-text