Дослідження енергетичних показників струменево-нішевої системи спалювання палива

Abstract

В роботі представлено результати експериментальних досліджень температурного стану факелу та продуктів згоряння зрідженого газу в струменево-нишевій системі спалювання та стабілізації палива. В результаті вимірювань отримані закономірності температурного поля факелу, його конфігурації в залежності від основних геометричних параметрів паливорозподілу. Установлені ефекти впливу відносно величини діаметру та кроку розташування паливних отворів і відстані від зривної кромки стабілізатора на організацію механізму горіння палива.This scientific paper is devoted to the studies of a temperature state of the torch for the propane-butane mixture firing in conditions of the jetniche combustion system and the flame stabilization. The investigation was carried out to define the torch length and the configuration of it and detect the effects of the influence of fuel distribution parameters (fuel port diameters, the arrangement pitch and the distance from the stall edge of stabilizer L1) on the torch length (range) for the combustion of liquefied and natural gases. It was established that the temperature distribution corresponds to general ideas of the influence of combustion mechanism that is realized in certain cases. Combustion of a high-calorific propane-butane mixture requires the adjustment of fuel distribution system through an increase in the relative pitch and the distance L1 in comparison with the geometry adopted for natural gas. The obtained data showed that a maximum homogenization of the fuel mixture can be achieved through the selection of appropriate parameters. A rise of the temperature in the core flame by 85 to 120 °С and a decrease in the visible length of it by 20…50 % are indicative of this fact. Homogenization also results in a certain shortening of the range of smooth fuel burning in terms of excess air coefficient. In this case the combustion mechanism is shifting to the kinetic domain. In the case of use of the fuel supply geometry that is intended for less calorific gasses the pure diffusion fuel combustion is realized for the liquefied gas combustion. This combustion mechanism is characterized by a considerable persistence of the combustion front and an increased amount of underfired (unburnt) fuel, though it manifests the highest flame smoothness in terms of excess air coefficient. Investigation of the torch geometry and the temperatures allowed us to obtain the following parameters of fuel distribution for the liquefied gas combustion d = 2…6 mm, S = 3.8…6.5, L1 = 10…25 mm. The recommended parameters enable the realization of combustion mechanism that is shifted to the kinetic domain. Practical dependences of the torch length on studied fuel supply parameters were obtained.