ENERGY RESPONSE RESEARCHING OF THE JET-FUEL COMBUSTION NICHE SYSTEM

Анотація

The work is devoted to the investigation of the temperature state of a torch during the combustion of a propane-butane mixture in the jet-niche combustion and flame stabilization system. Investigations were carried out to determine the length and configuration of the torch, as well as to identify the effects of the fuel distribution parameters (fuel hole diameters, their pitch, and distances from the breakaway edge of the stabilizer L₁) on the length (range) of the torch during the combustion of liquefied and natural gases. It is established that the temperature distribution is correspond to generally accepted ideas about the effect of the combustion mechanism, which is realized in this or that case. Thus, burning a high-calorie propane-butane mixture requires adjusting the fuel distribution system by increasing the relative pitch and distance L₁ in comparison with the geometry adopted for natural gas. Results showed that the selecting the appropriate parameters allow to achieve maximum homogenization of the fuel mixture. By this means increasing temperature in the core of the flare is on average by 85 ... 120 ºС and a decrease in the apparent length by 20 ... 50%. In the same way homogenization leads to a certain narrowing of the range of stable burning of fuel by the excess air factor. In this case, the combustion mechanism shifts to the kinetic region. In the case of using the fuel delivery geometry for less caloric gases, the combustion of liquefied gas is purely diffusive combustion of the fuel. This combustion mechanism is characterized by a significant tightening of the combustion front and an increase in the fuel underexposure, although it has the greatest flame stability in terms of the excess air factor. As a result of investigation of the temperatures and geometry of the flame, the following fuel distribution parameters were obtained for the combustion of liquefied gas: d = 2 ... 6 mm, = 3.8 ... 6.5, L₁ = 10..25 mm. The recommended parameters allow implementing the combustion mechanism shifted to the kinetic region. Practical dependences of length of a torch from investigated parameters of fuel supply are received.