@techreport{oai:jaxa.repo.nii.ac.jp:00044851,
 author = {三輪, 等 and MIWA, Hitoshi},
 month = {Jan},
 note = {In order to predict the control characteristics of the settling chamber pressure of the NAL Blowdown Type Two-Dimentional Transonic Wind Tunnel, which can be operated at high Raynolds number up to 40×10(exp 6), a numerical simulation was carried out. In addition to the conventional operation of blowdown type wind tunnels, a new operational method which can be called a “precharged operation” is adopted for the starting process in this wind tunnel. This method makes the wind tunnel start with precharged air of nearly the same pressure as the operational settling chamber pressure. In this paper, the mathematical model for the wind tunnel and control system is described, and the result of the simulation study is presented and discussed. The result of the numerical simulation for the precharged operation are as follows. 1.In this control, the flow state in the wind tunnel changes moderately from an initial to a steady state and the transient overshoot of the settling chamber pressure which is usually observed in conventional blowdown wind tunnels, is not observed. Therefore the starting time is shorter for this operation than the conventional ones. 2.As the amount of compressed air in the tank, which is wasted before the flow is established, is smaller, the duration of the steady state is longer for the precharged operation than the conventional ones. 3.Control characteristics of the settling chamber pressure in this type of operation is quite satisfactory and predicted error of the control is within 0.3％, 資料番号: NALTR0597000, レポート番号: NAL TR-597},
 title = {二次元風胴構成要素の研究(Ⅲ)-集合胴圧力制御のディジタルシミュレーション-},
 year = {1980}
}