TY - JOUR
T1 - New defrosting method using jet impingement for precooled turbojet engines
AU - Fukiba, Katsuyoshi
AU - Inoue, Shou
AU - Ohkubo, Hidetoshi
AU - Sato, Tetsuya
N1 - Funding Information:
The authors gratefully acknowledge Shujiro Sawai for his logistic support, which has enabled us to conduct this experiment. This research was also supported by a Grant-in-aid for scientific research (No. C19560793) provided by the Japan Society for the Promotion of Science.
PY - 2009
Y1 - 2009
N2 - Precooled turbojet engines are effective propulsion systems for hypersonic aircraft. However, a serious problem is that frost forms on the cooling tubes of the precooler, thereby decreasing the engine performance. This paper presents a new method for defrosting the precooler using jet impingement. The validity of the proposed defrosting method was investigated through fundamental experiments. In the experiments, the frost formed on the cooling tubes of the single-row heat exchanger was removed by jet impingement. We used the jet periodically. The jet interval is 10-50 s. In addition, the jet duration is short (about 0.1 s). Therefore, the consumption of the high-pressure air to make the jet flow is small. The coolant temperature and main flow speed influences on the defrosting method effectiveness were assessed. Results show that this defrosting method is effective, especially when the coolant temperature and the main flow speed are low.
AB - Precooled turbojet engines are effective propulsion systems for hypersonic aircraft. However, a serious problem is that frost forms on the cooling tubes of the precooler, thereby decreasing the engine performance. This paper presents a new method for defrosting the precooler using jet impingement. The validity of the proposed defrosting method was investigated through fundamental experiments. In the experiments, the frost formed on the cooling tubes of the single-row heat exchanger was removed by jet impingement. We used the jet periodically. The jet interval is 10-50 s. In addition, the jet duration is short (about 0.1 s). Therefore, the consumption of the high-pressure air to make the jet flow is small. The coolant temperature and main flow speed influences on the defrosting method effectiveness were assessed. Results show that this defrosting method is effective, especially when the coolant temperature and the main flow speed are low.
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U2 - 10.2514/1.40491
DO - 10.2514/1.40491
M3 - Article
AN - SCOPUS:68349120385
SN - 0887-8722
VL - 23
SP - 533
EP - 542
JO - Journal of Thermophysics and Heat Transfer
JF - Journal of Thermophysics and Heat Transfer
IS - 3
ER -