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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.

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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.

This article is dedicated to the problems of reliability, long-term thermal capacity and operational efficiency rate of PTVM and KGVM hot-water boilers. Based on the analysis of statistic data, tests, and certain works on increase of efficiency and reliability of PTVM-100 tower hot-water boilers, which were performed in Kazakhstan, it may be said that the reconstruction of PTVM-100 boilers accomplished on CHP was mainly aimed at the increase of reliability while saving the operational efficiency of boilers almost without changes. If the boiler is operating on fuel oil and without periodical washes, then it is possible to achieve consistent operation only under 75% of the nominal operational load. Structural changes of the PTVM-100 boiler unit offered by authors, along with the increase of operational reliability on fuel oil and it’s thermal capacity, allow increasing boiler’s efficiency rate up to 91-92% if it is operated under nominal load and using fuel oil. Structure the new KV-GM 55 hot-water boiler with horizontal design includes the two-row bi-radiated screen wrapping around the furnace and the new arrangement of convective packs, which are now located next to each other, allowed to increase heating characteristics of the boiler significantly due to the intensification of heat exchange and decrease of temperature of gases released from behind of the boiler unit, as well as to increase boiler’s efficiency rate up to 92,5% under nominal load.