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Manav Tyagi
Indian Institute of Technology Madras
15Publications
4H-index
101Citations
Publications 15
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#1Manav Tyagi (Indian Institute of Technology Madras)H-Index: 4
#2Raman Sujith (Indian Institute of Technology Madras)H-Index: 24
Last.Subith Vasu (Indian Institute of Technology Madras)H-Index: 20
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A theory of nonlinear wave propagation in quasi-one-dimensional non-uniform gasdynamic flows is developed in order to explain the effect of flow non-uniformity on nonlinear processes such as shock formation and wave quenching. The methodology used is the tracking of the propagating wave front in a hyperbolic system whose evolution is governed by a first order nonlinear ordinary differential equation (Riccati's equation). The present work is an extension of Whitham's wave front expansion method f...
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#1Manav Tyagi (Indian Institute of Technology Madras)H-Index: 4
#2Nachiket Jamadar (Indian Institute of Technology Madras)H-Index: 1
Last.Satyanarayanan R. Chakravarthy (Indian Institute of Technology Madras)H-Index: 17
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Abstract The heat release response of a two-dimensional (2-D) co-flow diffusion flame is theoretically investigated for the mass fraction fluctuations of reactant concentration at the inlet boundary and for time-varying spatially uniform flow velocity field in the domain. The present work is an extension of the Burke–Schumann steady flame model to an oscillatory situation, but in a 2-D framework. The governing equation of the problem is the scalar advection equation for the Schwab–Zel'dovich var...
30 CitationsSource
#1Manav Tyagi (Indian Institute of Technology Madras)H-Index: 4
#2Satyanarayanan R. Chakravarthy (Indian Institute of Technology Madras)H-Index: 17
Last.Raman Sujith (Indian Institute of Technology Madras)H-Index: 24
view all 3 authors...
This paper explores some fundamental issues involved in flame–acoustic interaction in the context of non-premixed flames. The combustion model considered is a two-dimensional co-flowing non-premixed flame in a uniform flow field, as in the Burke–Schumann geometry. Both finite-rate and infinite-rate chemistry effects are examined. First, the velocity-coupled response of the flame to an externally imposed velocity fluctuation is studied at various frequencies of interest. The Damkohler number play...
41 CitationsSource
#1Sriram DoraiswamyH-Index: 7
#2Manav TyagiH-Index: 4
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The present work is a numerical investigation of the combustion instability arising in a duct having non-premixed flame. The combustion occurs in a small zone inside the duct which acts as source of energy to the longitudinal acoustic waves in the duct. The presence of acoustics in duct causes the time variation in the pressure and velocity fields in the combustion zone. A two dimensional thermo-diffusive model is adopted for the combustion simulation. In the acoustic zone, the inhomogeneous wav...
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#1Manav TyagiH-Index: 4
#2Raman SujithH-Index: 24
Source
#1Manav TyagiH-Index: 4
Last.Raman SujithH-Index: 24
view all 3 authors...
This paper explores some fundamental issues involved in flame-acoustic interaction in the context of non-premixed flames. The combustion model considered is a two-dimensional co-flowing non-premixed flame. Both finite rate and infinite rate chemistry effects are examined. First, the velocity-coupled response of the flame to an externally imposed velocity fluctuation is studied at various frequencies of interest. The Damkohler number plays an important role in determining the amplitude and phase ...
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#1Manav Tyagi (Indian Institute of Technology Madras)H-Index: 4
#2Raman Sujith (Indian Institute of Technology Madras)H-Index: 24
This paper investigates the nonlinear distortion of a finite amplitude gasdynamic disturbance propagating outward/inward in the atmosphere of a celestial body. The Euler equations for isentropic flow considering the effect of gravitational field of the celestial body are solved for a spherically symmetric disturbance. A nonlinear ordinary differential equation for the evolution of a propagating wave front is obtained. This equation can be integrated to obtain a closed form solution for the slope...
6 CitationsSource
#1Manav Tyagi (Indian Institute of Technology Madras)H-Index: 4
#2Raman Sujith (Indian Institute of Technology Madras)H-Index: 24
This paper presents an investigation of the nonlinear steepening of a gasdynamic disturbance propagating in a steady non-uniform base flow. The base flow is the steady compressible flow of a gas in a variable-area duct. The quasi-one-dimensional continuity, momentum and energy equations for the unsteady disturbance in homentropic flow are solved using the method of characteristics (wave front expansion technique). A closed-form solution for the slope of the disturbance at the wave front is obtai...
4 CitationsSource
#1Subith VasuH-Index: 20
#2Manav TyagiH-Index: 4
Last.Raman SujithH-Index: 24
view all 3 authors...
2 CitationsSource
#2Manav TyagiH-Index: 4
Last.Raman SujithH-Index: 24
view all 3 authors...
The present work investigates the problem of finite amplitude longitudinal oscillations in a straight duct with initially present temperature gradient. The one-dimensional gasdynamics equations: continuity, momentum and energy; with appropriate boundary conditions specified at both the ends are solved using Galerkin method. The formulation leads to a system of coupled nonlinear ordinary differential equations in time. These equations are solved numerically from initial state till the limit cycle...
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