J.of Soc of Agri Struc, Japan.
Vol.29,No.3 December 1998,159-167
Original:
Language: Japanese

    A wind tunnel experiment was carried out to investigate the airflow field in a single span Venlo type greenhouse with wind force effect. The air flow patterns were visualized under the conditions of different eaves height or ventilator openings. The results showed very complex air flow pattern.
    When the first windward ventilators were open, the inflow through the first windward ventilators performed a recirculating flow in the greenhouse. When the first ventilators were closed, there was no recirculating flow and the inside distribution of velocities were lower. In case of the heigh eaves (4m height), the horizontal component of inflow through the first windward ventilators was smaller than in case of traditiona lower eaves (3m height).
    The first windward ventilator opening was most influent on the airflow pattern in the greenhouse and the next influent opening was the leeward ventilator. The second and third windward opening ventilators had less influence on inside airflow. The inflow velocities were about 0.6 ms^-1 at the first windward ventilator either when the except ventilators were open or close. Directions of inflow or outflow through the openings were different at the front face or side face of each ventilators except the first windward ventilator.

Keywords: Venlo type greenhouse, wind force ventilation, wind tunnel experiment, visualization, PIV analysis, airflow patten, eaves height, ventilator

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