Abstract
The unsteady fluid flow past a bluff body has been widely studied, particularly due to the distinctive flow features observed in the wake of the bluff body itself. The inherently complex nature of the problem has promoted several investigations over the past few decades. Apart from the non-reacting situation, bluff bodies have also been used in reacting flows as flame holders in various practical combustors. Recently, some researchers have reported practical scenarios where a different fluid is injected from ports on the bluff body on to the free stream, and there exist a few studies on the dynamics of such a flow scenario in both the non-reacting and reacting cases. The present chapter presents a brief review of the recent developments on flow past a bluff body in the non-reacting and reacting flow situations. The chapter also highlights the distinctive dynamics of flow past a bluff body when another fluid is injected from the bluff body itself. The effectiveness of the proper orthogonal decomposition technique to analyze the dynamics of flows past bluff bodies is also highlighted.
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Abbreviations
- \(C_{\text{L}}\) :
-
Lift coefficient
- \(D\) :
-
Diameter of the cylinder
- \(f\) :
-
Frequency of vortex shedding
- \(F_{\text{L}}\) :
-
Lift force
- \(p\) :
-
Pressure
- \(Re\) :
-
Reynolds number
- \(St\) :
-
Stokes number
- \(T_{\text{b}}\) :
-
Temperature of the burnt gas
- \(T_{\text{u}}\) :
-
Temperature of the unburnt gas
- \(u\) :
-
x velocity
- \(U_{\infty }\) :
-
Free stream velocity
- \(v\) :
-
y velocity
- \(\varepsilon\) :
-
Ratio of the velocities of the injected stream to the free stream
- \(\eta_{i}\) :
-
Cumulative energy coefficient
- \(\zeta_{i}\) :
-
Participant energy coefficient
- \(\lambda^{i}\) :
-
ith eigenvalue
- \(\mu\) :
-
Dynamic viscosity
- \(\nu\) :
-
Kinematic viscosity
- \(\rho\) :
-
Density
- \(\omega\) :
-
Vorticity
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Sen, U., Sarkar, S., Bagchi, S., Mukhopadhyay, A., Sen, S. (2020). Dynamics of Non-reacting and Reacting Flows Past Bluff Bodies. In: Gupta, A., De, A., Aggarwal, S., Kushari, A., Runchal, A. (eds) Innovations in Sustainable Energy and Cleaner Environment. Green Energy and Technology. Springer, Singapore. https://doi.org/10.1007/978-981-13-9012-8_18
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