Abstract
Supplying a homogeneous mixture of gas fuel and air to a combustion chamber is a challenging problem. Having a good mixture leads to better fuel economy and low combustion emissions. In this study, a venturi-mixer prototype has
been developed for mixing natural gas with air flowing in a pipe. The aim is to provide a better spatial mixing within a short distance from the injection point while keeping small pressure drop. A standard ASME venturi design has been
adopted in this study with a throat to pipe diameter ratio 0.4. A three-dimensional CFD simulation together with Taguchi optimization technique has been employed to study the effect of fuel injection geometrical parameters on the mixing process. The simulation was carried out assuming isothermal conditions while taking into account the turbulence by considering SST k – ω model. The optimized parameters that has been studied are the hole diameter,
number and intrusion distance inside the venturi from the throat wall. The uniformity of the fuel mass fraction at a distance equal to the pipe diameter has been evaluated using the uniformity index function and accordingly, the optimum design values for the three design parameters have been identified. It was shown that with an optimum design it is possible to achieve a uniformity index of 91% with further improvement downstream the pipe.
been developed for mixing natural gas with air flowing in a pipe. The aim is to provide a better spatial mixing within a short distance from the injection point while keeping small pressure drop. A standard ASME venturi design has been
adopted in this study with a throat to pipe diameter ratio 0.4. A three-dimensional CFD simulation together with Taguchi optimization technique has been employed to study the effect of fuel injection geometrical parameters on the mixing process. The simulation was carried out assuming isothermal conditions while taking into account the turbulence by considering SST k – ω model. The optimized parameters that has been studied are the hole diameter,
number and intrusion distance inside the venturi from the throat wall. The uniformity of the fuel mass fraction at a distance equal to the pipe diameter has been evaluated using the uniformity index function and accordingly, the optimum design values for the three design parameters have been identified. It was shown that with an optimum design it is possible to achieve a uniformity index of 91% with further improvement downstream the pipe.
| Original language | English |
|---|---|
| Title of host publication | Proceedings of the 13th International Combustion Symposium, Bursa, Turkey |
| Pages | 9-11 |
| Number of pages | 3 |
| Publication status | Published - 2015 |
| Event | 13th International Combustion Symposium - Bursa, Turkey Duration: 9 Sep 2015 → 11 Sep 2015 |
Conference
| Conference | 13th International Combustion Symposium |
|---|---|
| Country/Territory | Turkey |
| City | Bursa |
| Period | 9/09/15 → 11/09/15 |