Abstract
Generally, micro gas turbines are in the range of 15 to 300 kW. However, recent applications in unmanned aerial vehicles (UAVs) and polygeneration require a small micro gas turbine. So, here a small swirl combustor designed for micro gas turbine engine of capacity less than 1 kW is analyzed under nonreacting flow conditions. Simulations have been carried out to study the flow field inside the can combustor. Flow field characteristics, like velocity, path lines, turbulent intensity and total pressure loss are studied. The total pressure loss across the combustor is also measured experimentally and compared with that of simulation results. Good agreement is achieved between experimental and numerical results. The combustor total pressure drop was found to be negligible in the range of 0.002 to 0.06% at an inlet velocity ranges from 1.7 to 10.19 m/s. Flow pattern indicates a strong swirling pattern and strong interaction between the secondary air entrainment inside the flame tube.
Highlights
Due to the requirement of high rpm of turbo machinery for the sake of efficiency, most of the micro gas turbine was developed for a power in range of 15 to 300 kW (Nascimento et al 2013)
The purpose of the present study is to investigate a nonreacting flow inside the newly designed 3 kW thermal power swirl stabilized micro gas turbine combustor
The flow field inside a can combustor has been analyzed for a 90-degree sector model under nonreacting flow conditions
Summary
Due to the requirement of high rpm of turbo machinery for the sake of efficiency, most of the micro gas turbine was developed for a power in range of 15 to 300 kW (Nascimento et al 2013). Recent need in combined heat and power generation (CHP) at remote places, distributed generation is economically viable and reduces transmission losses (Pilavachi 2002). Recent advances in the development of recuperate have enabled to increase the net electrical efficiency of MGT from 12 to 17% (Xiao et al 2017). Another potential application of this is for power generation to run mobile tower at remote places, which typically require around 12 kW. This technology favors poly generation and enhance overall efficiency by utilization of waste heat (Rahman and Malmquist 2016). Gas turbine technology is highly suitable for power generation from biofuels, as it offers good flexibility to be used with a variety of fuels with
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