Müslüm Arıcı

Performance and Emissions of a Micro-Turbine Fueled with JP8-Canola Biodiesel Mixtures

In this study, a micro gas turbine was operated with JP8 and canola biodiesel blends. The blends tested were JP8, 40% of biodiesel, 60% of biodiesel, and 80% of biodiesel by volume. The turbine was run at 3 speeds, 60.000, 80.000 and 105.000 rpm. Engine power generation and emissions performance were determined. The results reveal that as biodiesel content in the fuel mixture increased, the fuel flow rate increased to maintain the constant speed operation and equivalence ratio reduced. It was shown that TJ35 engine can operate with biodiesel blends in JP8 without sacrificing thrust. In fact, 80% biodiesel blend increased the thrust at 105.000 rpm by 2% compared to JP8. Exhaust gas temperatures slightly reduced with increasing biodiesel content. Higher biodiesel blends resulted in higher CO2, CO and CxHy emissions while O2 emissions reduced. This study demonstrates that a micro gas turbine engine could be operated successfully with JP8-canola biodiesel blends, which means the engine could be utilized in distributed and remote off-grid locations for power generation by burning renewable biodiesel fuels.Copyright

Performance Comparison of High Resolution Schemes

In the last decades, a great number of high resolution schemes (HRSs) have been proposed to obtain highly accurate and non-oscillatory solutions in the numerical simulation of the flows. In this work, the performance of various HRSs for time-dependent problems is studied. To do this, HRSs are applied to a test problem. In the test problem, advection of rectangular, semi-ellipse, sine-squared and triangular profiles in a constant velocity field is solved. Numerical solutions are obtained for each profile for CFL numbers of 0.98, 0.50, 0.25, 0.10 and 0.05 and for non-dimensional times of 50, 100 and 250. Computations show that some HRSs are not bounded. Also, It is observed that compressive schemes have less error than diffusive schemes and give more satisfactory results particularly for small CFL numbers for time-dependent problems.