This paper illustrates some pitfalls in the interpretation of flow visualisation images of delta wing leading-edge vortices. Numerical simulations of tracer particle trajectories in around straight and helical vortices are presented, representing unburst and burst delta wing vortices respectively. For straight vortices, the appearance of the ‘smoke-ring’ effect in wind tunnel testing is analyse...

Title of Document: HOMOGENEOUS AND HETEROGENEOUS SENSORS FOR COMBUSTION SYSTEMS Amir Eshaghi, PhD, 2012 Directed By: Distinguished University Professor, Professor Ashwani K. Gupta, Department of Mechanical Engineering Due to increasingly stringent emission regulations, it is important to develop clean combustors. Combustion behavior is very complex in almost all practical power plant systems. M...

The paper investigates the impact of heat release and pilot jet location on the swirling flow structures in a coannular swirl burner without confinement. Two iso-thermal turbulent swirling flow cases and three turbulent premixed swirling flames are studied with the aid of large-eddy simulation. Two geometries are considered, one featuring a pilot lance flush with the outlet and one with retract...

Landau solutions are special to the stationary incompressible Navier-Stokes equations in three dimensional space excluding origin. They self-similar and axisymmetric with no swirl. In fact, any smooth solution must be a solution. effort of extending this result one for class pointwise scale-invariant bound $|u(x)|\leq C_0|x|^{-1}$ some $C_0>0$, we consider discretely solutions, investigate exis...

Soil cyanobacterium, FBCC-A195 were isolated from the soil underneath Jangnak Bridge, Republic of Korea. The was studied using light microscopy (LM), transmission electron (TEM), 16S rRNA, 16S–23S ITS, and ecological data. showed circular cross-section trichome, broad mucilaginous envelopes, a swirl-like pattern thylakoids inside cell, lowest length/width ratio within genus. In rRNA phylogeny, ...

The primary moisture separator—a key component in the PWR nuclear power plant—determines quality of supplied steam to a turbine. Investigating its characteristics is important because supplying with excessive droplet entrainment results damages pipes, valves, and turbines plant circuits. In this numerical study, particle tracking method Eulerian–Lagrangian methodology used investigate separator...

The development of combustion systems to minimize the emission of pollutants and to increase the system’s efficiency involves modifications of the combustion process using premixed systems and highly turbulent swirl stabilized flames. However, these modifications of the combustion process usually lead to stability problems caused by the appearance of combustion-driven oscillations. Therefore, i...