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Theemission composition is measured for a prototype burner while varyingthe equivalence ratio in discrete portions of the burner. Theburner is a three sector system, consisting of a separateigniter, pilot/stabilizer and main burner. The design allows for discretecontrol of equivalence ratio in each of the three sectors.The ignition sector, designated RPL (Rich-Pilot-Lean), operates from rich tolean equivalence values, and serves to ignite the pilot sector,which, in turn, stabilizes the main combustion sector. All threeburner sections are premixed. The burner is operated at atmosphericpressure...
In this paper, effect of geometric parameters of a centrifugal fan with backward- and forward-curved blades has been investigated. Centrifugal fans are used for enhancing the heat dissipation from the IC engine surfaces. In the process, the fan consumes power generated from the engine. As a first step, an experimental setup was developed and prototypes of fans were made to carry out measurements of flow and power consumed by the fan. The fan mounting setup was such that fan with uniform blades can be tested. Generally, fans have cut blades on the vehicle due to mounting accessories. We...
We present the results from the 3-D numerical simulations on the optimization of the fan-cooling system in a two-wheeler 4-stroke single cylinder engine. Objective was to optimize the flow rate and distribution of flow over the engine surfaces to keep the maximum temperature of engine oil and engine surfaces well within the lubrication and material limit respectively at the expense of minimum increase in fan power. This work aimed at reducing the engine oil temperature by 20°C. Combined flow and heat transfer analysis (Conjugate analysis) was conducted with the engine head and block modeled...
A high temperature reactor (HTR) is envisaged to be one of the renewed reactor designs to play a role in nuclear power generation including process heat applications. The HTR design concept exhibits excellent safety features due to the low power density and the large amount of graphite present in the core which gives a large thermal inertia in the event of an accident such as loss of coolant. However, the possible appearance of hot spots in the pebble bed cores of HTR may affect the integrity of the pebbles. This has drawn the attention of several scientists to understand this highly three-...
Reacting flow modeling in STAR-CCM+
In order to meet ever challenging emission requirements while efficiency of reacting flow devices is increasing, STAR-CCM+ provides advanced reacting flow model capabilities that incorporate finite-rate chemistry and keep the computational time manageable at the same time. The models work for both, low and high-Mach number applications as well as for multi-phase flows. Examples demonstrating these capabilities will be shown. Validation of soot, NOx and CO against canonical flames using these models will also be presented. Furthermore, flexibility is provided for the users to add source terms...
Modeling of the flow in a water turbine of a hydroelectric generator
The efficiency of generating units is of great economic importance to the operation of hydropower. Even a small improvement in their efficiency leads to a significant economic effect. Numerical simulation of the hydro turbine has many advantages over experimental studies. In this presentation the process of modeling the flow in a hydrоelectric generator will be outlined. Different configurations of stator and rotor blades were investigated numerically. Parameters relevant to efficiency and performance were obtained and analyzed. The focus is on a seamless workflow process in STAR-CCM+ and the...
Not with standing the hype surrounding electric vehicles powered by expensive brushless inverter-fed machines, the commutator motor remains one of the most important of all electric machines. It powers almost all commuter trains worldwide. It is by far the most important auxiliary motor in automobiles, for fuel pumps, windscreen wipers, blowers, fans, etc. As an AC motor it is common in power tools, in washing machines, in floor-care products, and in food processing. The design of the commutator motor is a true "multi-physics" challenge. It involves not only the normal mechanical CAD, but...

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