Work

Improvement on shaped-hole film cooling effectiveness by integrating upstream sand-dune-shaped ramps

Year: 2020

Type: article

Abstract: A numerical investigation and experimental validation is performed to address deeper insights into the combined effect of shaped holes and Sand-Dune-shaped upstream Ramp (SDR) on enhancing the film cooling effectiveness, under a wide blowing ratio range (M = 0.25–1.5). Three kinds of holes (Cylindrical Hole (CH), Fan-Shaped Hole (FSH), and Crater-Shaped Hole (CSH)) are taken into consideration. The SDR shows an inherent affecting mechanism on the mutual interaction of jet-in-crossflow. It aggravates the lateral spreading of cooling jet and thus improves the film cooling uniformity significantly, regardless of film-hole shape and blowing ratio. When the blowing ratio is beyond 1.0, the combined effect of shaped holes and SDR on improving film cooling effectiveness behaves more significantly. It is suggested that FSH-SDR is a most favorable film cooling scheme. For FSH-SDR case, the spatially-averaged film cooling effectiveness is increased monotonously with the increase of blowing ratio, among the present bowing ratio range.

Source: Chinese Journal of Aeronautics

DOI: 10.1016/j.cja.2020.10.011

Authors: Shengchang ZHANG, Jingzhou ZHANG, Xiaoming TAN

Institution: Nanjing University of Aeronautics and Astronautics

Language: English

Topic: Turbomachinery Performance and Optimization

Subfield: Aerospace Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $2,000

Funders: National Natural Science Foundation of China, National Major Science and Technology Projects of China