Effect of Film Position on the Flow and Heat Transfer Characteristics of Full-Ribbed Rotor Tip
This article numerically studied the flow and heat transfer characteristics of the full-ribbed fluted tip of a rotor with four types of distribution of cooling films, namely, the mid-arc uniform film at the bottom of the groove, the uniform film on full perimeter ribs, the uniform film on the suctio...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Frontiers Media S.A.
2022-02-01
|
| Series: | Frontiers in Energy Research |
| Subjects: | |
| Online Access: | https://www.frontiersin.org/articles/10.3389/fenrg.2022.845350/full |
| _version_ | 1818324428281348096 |
|---|---|
| author | Haimeng Zhou Chenglong Wang Zhiqi Kong Wei Du Zhongqi Wang |
| author_facet | Haimeng Zhou Chenglong Wang Zhiqi Kong Wei Du Zhongqi Wang |
| author_sort | Haimeng Zhou |
| collection | DOAJ |
| description | This article numerically studied the flow and heat transfer characteristics of the full-ribbed fluted tip of a rotor with four types of distribution of cooling films, namely, the mid-arc uniform film at the bottom of the groove, the uniform film on full perimeter ribs, the uniform film on the suction-side rib, and the uniform film on the pressure-side rib. The evolution of secondary flow in the tip clearance under these four conditions was discussed, and the effect of cooling film position on the tip leakage flow and tip heat transfer was also studied. The results showed that films in the ribs were more conducive to lower leakage flow rates and can reduce total energy losses. Adding cooling films on the single-side rib had a better effect on the control of leakage flow rate, with the most significant improvement due to adding cooling films on the suction-side rib. The mid-arc jet at the bottom of the groove can greatly contain the swirl structure in the groove, but it weakened the air sealing effect, which led to a rise in leak flow. The main reason for the swirl structure in the groove was that the leakage flow from the tip of the rotor was blocked by the cold air jet from the cooling films to form a backflow. The vortex inside the groove was the most violent when the air film hole was set on the pressure side, so the loss coefficient was higher, while the vortex inside the groove was the simplest when the cooling film hole was set on the suction side, and the energy loss caused by the vortex inside the groove was the least, and this structure was more favorable to the cooling of the leaf tip. It was also found that the uniformity of the outlet airflow angle distribution improved in the presence of cold air injection on the tip of the rotor. |
| first_indexed | 2024-12-13T11:28:26Z |
| format | Article |
| id | doaj.art-c659b2e6f8814e50b31eac2d5c9ea181 |
| institution | Directory Open Access Journal |
| issn | 2296-598X |
| language | English |
| last_indexed | 2024-12-13T11:28:26Z |
| publishDate | 2022-02-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Energy Research |
| spelling | doaj.art-c659b2e6f8814e50b31eac2d5c9ea1812022-12-21T23:48:04ZengFrontiers Media S.A.Frontiers in Energy Research2296-598X2022-02-011010.3389/fenrg.2022.845350845350Effect of Film Position on the Flow and Heat Transfer Characteristics of Full-Ribbed Rotor TipHaimeng Zhou0Chenglong Wang1Zhiqi Kong2Wei Du3Zhongqi Wang4School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, ChinaScience and Technology on Scramjet Laboratory, National University of Defense Technology, Changsha, ChinaBeijing Power Machindry Institution, Beijing, ChinaSchool of Energy Science and Engineering, Harbin Institute of Technology, Harbin, ChinaSchool of Energy Science and Engineering, Harbin Institute of Technology, Harbin, ChinaThis article numerically studied the flow and heat transfer characteristics of the full-ribbed fluted tip of a rotor with four types of distribution of cooling films, namely, the mid-arc uniform film at the bottom of the groove, the uniform film on full perimeter ribs, the uniform film on the suction-side rib, and the uniform film on the pressure-side rib. The evolution of secondary flow in the tip clearance under these four conditions was discussed, and the effect of cooling film position on the tip leakage flow and tip heat transfer was also studied. The results showed that films in the ribs were more conducive to lower leakage flow rates and can reduce total energy losses. Adding cooling films on the single-side rib had a better effect on the control of leakage flow rate, with the most significant improvement due to adding cooling films on the suction-side rib. The mid-arc jet at the bottom of the groove can greatly contain the swirl structure in the groove, but it weakened the air sealing effect, which led to a rise in leak flow. The main reason for the swirl structure in the groove was that the leakage flow from the tip of the rotor was blocked by the cold air jet from the cooling films to form a backflow. The vortex inside the groove was the most violent when the air film hole was set on the pressure side, so the loss coefficient was higher, while the vortex inside the groove was the simplest when the cooling film hole was set on the suction side, and the energy loss caused by the vortex inside the groove was the least, and this structure was more favorable to the cooling of the leaf tip. It was also found that the uniformity of the outlet airflow angle distribution improved in the presence of cold air injection on the tip of the rotor.https://www.frontiersin.org/articles/10.3389/fenrg.2022.845350/fullfluted blade tipblade tip leakage flowfilm coolingrotorheat transfer |
| spellingShingle | Haimeng Zhou Chenglong Wang Zhiqi Kong Wei Du Zhongqi Wang Effect of Film Position on the Flow and Heat Transfer Characteristics of Full-Ribbed Rotor Tip Frontiers in Energy Research fluted blade tip blade tip leakage flow film cooling rotor heat transfer |
| title | Effect of Film Position on the Flow and Heat Transfer Characteristics of Full-Ribbed Rotor Tip |
| title_full | Effect of Film Position on the Flow and Heat Transfer Characteristics of Full-Ribbed Rotor Tip |
| title_fullStr | Effect of Film Position on the Flow and Heat Transfer Characteristics of Full-Ribbed Rotor Tip |
| title_full_unstemmed | Effect of Film Position on the Flow and Heat Transfer Characteristics of Full-Ribbed Rotor Tip |
| title_short | Effect of Film Position on the Flow and Heat Transfer Characteristics of Full-Ribbed Rotor Tip |
| title_sort | effect of film position on the flow and heat transfer characteristics of full ribbed rotor tip |
| topic | fluted blade tip blade tip leakage flow film cooling rotor heat transfer |
| url | https://www.frontiersin.org/articles/10.3389/fenrg.2022.845350/full |
| work_keys_str_mv | AT haimengzhou effectoffilmpositionontheflowandheattransfercharacteristicsoffullribbedrotortip AT chenglongwang effectoffilmpositionontheflowandheattransfercharacteristicsoffullribbedrotortip AT zhiqikong effectoffilmpositionontheflowandheattransfercharacteristicsoffullribbedrotortip AT weidu effectoffilmpositionontheflowandheattransfercharacteristicsoffullribbedrotortip AT zhongqiwang effectoffilmpositionontheflowandheattransfercharacteristicsoffullribbedrotortip |