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Уважаемые эксперты! Пожалуйста, ответьте на вопрос: Через сужающее сопло мартеновской фурмы диаметром d = 60 мм (диаметр выходного сечения сопла) проходит кислород, имеющий давление p1 = 0,65 МПа и температуру t1 = 35 [$186$]C на входе в сопло. Давление (абсолютное) среды, в которую происходит истечение кислорода, p2 = 101 кПа. Определить скорость потока на выходе из сопла, массовый расход кислорода через сопло, а также температуру, давление и плотность кислорода на выходе из сопла.
Полученная величина меньше, чем критическое отношение, равное для двухатомных газов, каковым является кислород, 0,528. Показатель адиабаты [i]k[/i] = 1,4.
Находим газовую постоянную [i]R[/i] для 1 кг кислорода (при массе 1 кмоля [i][$956$][/i] = 32 кг):
Находим скорость [b][i]w[/i][/b] потока на выходе из сопла:
Находим площадь [i]f[/i] сечения сопла:
Находим удельный объём [i]v[/i][sub]1[/sub] кислорода на входе в сопло:
Находим массовый расход [b][i]M[/i][/b] кислорода через сопло:
Если я правильно понимаю условие задачи, то давление кислорода на выходе из сопла составляет [b][i]p[/i][sub]2[/sub] = 101 кПа = 1,01 [$183$] 10[sup]5[/sup] Па[/b]. Находим температуру [b][i]T[/i][sub]2[/sub][/b] кислорода на выходе из сопла:
Находим плотность [b][i][$961$][/i][sub]2[/sub][/b] кислорода на выходе из сопла:
Литература Рабинович О. М. Сборник задач по технической термодинамике. - М.: Машиностроение, 1973. - 344 с.
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Facta loquuntur.
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