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Консультация № 186846
20.11.2012, 18:44
149.97 руб.
0
1
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Уважаемые эксперты! Пожалуйста, ответьте на вопросы:
1. Вытяжная труба системы вентиляции высотой H установлена на перекрытии корпуса, где плотность воздуха [$961$]1. Определить разряжение в сечении 1-1, если показания верхнего пьезометра h, плотность наружного воздуха [$961$]2.
2. Щит, закрывающий прямоугольный водовод имеет размеры H, В. Глубина воды перед щитом h. Определить силу давления воды на щит и точку приложения этой силы.
1. Вытяжная труба системы вентиляции высотой H установлена на перекрытии корпуса, где плотность воздуха [$961$]1. Определить разряжение в сечении 1-1, если показания верхнего пьезометра h, плотность наружного воздуха [$961$]2.
2. Щит, закрывающий прямоугольный водовод имеет размеры H, В. Глубина воды перед щитом h. Определить силу давления воды на щит и точку приложения этой силы.
Обсуждение
20.11.2012, 21:43
общий
это ответ
Здравствуйте, Дмитрий!
Для решения первой задачи составим уравнение равновесия:
откуда после преобразований получим
(Па),
где все величины в правой части формулы должны быть выражены в единицах СИ,
- плотность ртути.
Рассмотрим вторую задачу. Избыточное давление на свободной поверхности воды составляет
а на дне водовода 
Тогда давление в центре тяжести смачиваемого сечения водовода (в точке пересечения диагоналей прямоугольника со сторонами 
) равно 
сила давления воды на 1 м ширины щита равна 
а сила давления воды на щит равна 
(Па), где величины 
выражены в метрах. Центр давления находится на расстоянии 
выше дна водовода посередине его ширины. Сила давления воды на щит приложена в центре давления.
С уважением.
Для решения первой задачи составим уравнение равновесия:
откуда после преобразований получим
(Па),где все величины в правой части формулы должны быть выражены в единицах СИ,
- плотность ртути.Рассмотрим вторую задачу. Избыточное давление на свободной поверхности воды составляет
а на дне водовода Тогда давление в центре тяжести смачиваемого сечения водовода (в точке пересечения диагоналей прямоугольника со сторонами ) равно сила давления воды на 1 м ширины щита равна а сила давления воды на щит равна (Па), где величины выражены в метрах. Центр давления находится на расстоянии выше дна водовода посередине его ширины. Сила давления воды на щит приложена в центре давления.С уважением.
5
Об авторе:
Facta loquuntur.
Facta loquuntur.
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