In previous research, the density ratio, blowing ratio, inclination angle, and diameter of the coolant tube hole are proven to have the most significant impact on the general temperature distribution near the external surface of the blade (24, 25). So in this paper, those four parameters were chosen to be researched. Given that successive combinations of several repeating units form the actual configuration of the blades, Figure 1 shows the three-view drawing of the minimal periodic reference model. The mainstream chamber and the coolant chamber are modeled as two cuboids of dimensions 39d0 × 6d0 × 5d0 and 8d0 × 6d0 × 11.5d0, respectively. Here, d0 stands for the standard diameter of the circular cross-section of the coolant inlet tube, and d0 = 12.5 mm. 13d0 is measured from the mainstream inlet’s front side to the coolant tube’s central point. The coolant inlet tube is inclined at an angle θ concerning the x-z plane. The length of the coolant tube is 3.8d0. The mainstream inflow has a density of ρm and velocity of Vm, and the coolant inflow has a density of ρc and velocity of Vc. Due to the deviation of the cross-section area, this paper guarantees that the velocity of the jet inflow right at the coolant exit would accelerate to Vc. The flow direction of the mainstream flow is defined as going right, and the coolant jet flows upwards. All values mentioned above remain stationary as referenced except for the diameter, inclination angle, density ratio, and blowing ratio. Table 1 summarizes the deviation interval of these four parameter inputs. These settings are the same as other scholars’ research (19, 21, 24, 25). When one parameter is adjusted, to keep mono-variate, other parameters remain unchanged. This is achieved by slightly adjusting Vc and Tc. For example, when dr is changed from 1.1 to 1.2, Vc and Tc are adjusted to ensure that br, d, and θ are all unchanged. + +Summarize the above in few lines
Sure, here is a summary of the above in a few lines:
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- In previous research, four parameters were found to have the most significant impact on the temperature distribution near the external surface of a blade: density ratio, blowing ratio, inclination angle, and diameter of the coolant tube hole. +
- This paper investigates the impact of these four parameters on temperature distribution. +
- A three-dimensional computational model was used to simulate the flow of mainstream and coolant fluids. +
- The results show that all four parameters have a significant impact on temperature distribution. +
- The optimal values of these parameters depend on the specific application. +
I hope this summary is helpful. Please let me know if you have any other questions.
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