Blow-off performance and NO x emissions of the propane and air mixture in a rectangular combustion chamber with bluff bodies were investigated experimentally and numerically. The effects of distance between bluff bodies on NO x emissions, the blow-off limit, and exhaust gas temperature were examined. It was observed that NO x emissions are highly dependent on distance between V-gutters. The re-circulation zone behind the bluff body expands in width based on the decrease of distance between V-gutters, and expands in length with the increase of inlet velocity. The temperature fields behind the bluff body show a similar change, the temperature behind the bluff body reaches its highest when the distance between V-gutters reaches 20 mm, meaning it has better flame stability. The blow-off limit is significantly improved with the decrease of distance between V-gutters. The blow-off limit is greatly improved by reducing the distance between the V-gutters. Maximum blow-off limit of 0.
The article presents the results of numerical modeling of the effect of various fuel supply options on the combustion processes behind the turbine profiles. The article considered three options for fuel supply. In the first option, (a) the fuel is supplied to the wide side of the profile; in the second option, (b) the fuel is sprayed directly into the recirculation zone formed between the plate and the profiles; in the third option, (c) the fuel is sprayed from the convex (back) part of the profile. On the basis of the analysis performed, it can be concluded that the profiles of the blades have rather high stabilization parameters. The best performance has the option of supplying fuel from the back of the turbine profile. This option provides the minimum concentration of nitrogen oxides, with all other factors being equal.
В статье представлены результаты экспериментального исследования влияния угла β между профилем лопатки и накладкой на процессы образования оксидов азота, температуры на выходе из камеры сгорания, длину факела и стабилизацию пламени. В статье представлен общий анализ по использованию различных устройств при стабилизации пламени. В результате экспериментов было выявлено, что увеличение угла β приводит к повышению температуры на выходе из камеры сгорания, повышению концентрации оксидов азота и стабилизации пламени. Снижение угла β приводит к снижению концентрации оксидов азота, при β = 45 0 , до 16 ppm. Снижение до β = 30 0 снижает концентрацию оксидов азота до 7 ppm. Данные подтверждают экспоненциальную зависимость концентрации оксидов азота от температуры. При росте температуры на 8 %, повышает концентрацию оксидов азота на 128 %. При увеличении β до 60 0 коэффициент избытка воздуха α имеется значение 9,5, при β = 45 0 , α = 9. Причем значительный рост стабилизации заметен при изменении угла с 30 0 до 45 0 . Оптимальным углом β является 45 0 ввиду хорошей стабилизации пламени и сравнительно низких концентраций оксидов азота. Ключевые слова: коэффициент избытка воздуха, температура, оксиды азота, турбинные профили EXpERImENTAl STudy OF COmbuSTION pROCESS FOR TuRbINE pROFIlES 1 dostiyarov A.m., 2 umyshev d.R., 3 kibarin A.A., 3 katranova G.S.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.