Conjugated heat transfer investigation with racetrack-shaped jet hole and double swirling chamber in rotating jet impingement

Figures & data

Figure 1. Geometry details for the impingement cooling system.

Figure 2. Sketch of racetrack-shaped hole.

Table 1. Parameter details of the impingement

P/Dh,c	5	R3/Dh,c	1.6
R1/Dh,c	4.6	S3/R3	0.75
R2/Dh,c	4	R4/Dh,c	2
DS/Dh,c	8	S4/R4	0.9
a/Dh,c	1	R5/Dh,c	0.2
b/Dh,c	1	R6/Dh,c	0.2

Table 2. Summary of test condition for present study

m (kg/s)	Res	Rejet		Ω (rad/s)	Ros	Rojet
		Cylindrical	Racetrack			Cylindrical	Racetrack
5.752 × 10^−3	7,854	10,000	8,770	0	0	0	0
				36.4983	0.4889	0.006	0.006842
				72.9967	0.9778	0.012	0.013684
				145.9932	1.9557	0.024	0.027367
14.381 × 10^−3	19,635	25,000	21,923	0	0	0	0
				91.2459	0.4889	0.006	0.006842
				182.492	0.9778	0.012	0.013684
				364.983	1.9557	0.024	0.027367

Figure 3. Comparison of experiment and simulation.

Figure 4. Difference of time-averaged Nusselt number and total pressure loss.

Figure 5. Schematic of a mesh system.

Figure 6. Nusselt number distributions for semi-cylinder channel at different Rotation numbers.

Figure 7. Sketch of velocities and body forces in a rotating impingement cooling system.

Figure 8. Average streamwise Nu number distribution of the baseline case.

Figure 9. Nusselt number distributions for three cases at Ro_s = 0.9778.

Figure 10. Streamwise averaged Nusselt number distribution at the stationary and rotating conditions.

Figure 11. Temperature distributions on the outer solid surface.

Figure 12. v/U_jet distribution on the symmetry plane for the baseline case.

Figure 13. U/U_jet and temperature gradient distributions at two axial positions.

Figure 14. Turbulence kinetic energy distributions at Ro_s = 0.9778.

Figure 15. Averaged Nusselt number for four cases at Re_s = 7,854 and 19,635; Ro_s = 0 – 1. 9557.

Figure 16. Total pressure drop ratio for four cases at Re_s = 7,854 and 19,635; Ro_s = 0 – 1. 9557.