###### Abstract  
The energy needed for highly efficient heat transfer has shown a continuous growth, as the energy reduction. For highly efficient power convection, gas turbine is an important device at present. But, the design of highly efficient gas turbine is limited by the temperature and the material's temperature resistance around the inlet. One part of the inlet need to be protected from burning out is transition piece. A bionic thermal surface with rib turbulators is designed according to the turbulence function of alopias' branchial arches and is evaluated for thermo-protection enhancement in a simplified gas turbine transition piece using computational fluid dynamics (CFD) simulation. With the given diameter (\(\Phi\) = 10.26 mm) of the impinging hole, three different horizontal distances (\(S\)) from impinging holes to the front of first-row rib were solved, which were \(S_{1}\) = 20 mm, \(S_{2}\) = 40 mm, and \(S_{3}\) = 60 mm, respectively, in case 1. But, the results revealed that S is not a significant influence factor on heat transfer efficiency. The cooling coefficient increases from 0.194 to 0.198 when the distance varies from \(S_{1}\) to \(S_{3}\). In case 2, rib turbulator width (\(W\)) and height (\(H\)) have been studied in ranges from 0.5 \(\times\)\(\Phi\) to 1.5 \(\times\)\(\Phi\). All of the numerical results indicated that the best size of the rib turbulators could improve the heat transfer efficiency to 32.5%, when comparing with the smooth surface. All of the comparisons will benefit the structural design of heat transfer, which could be used for solving more severe problems in thermo-protection. captiontion, Heat Transfer, Bionic Thermode, Bionic Thermode, Thermode  
The transition piece, which is an important component combining the combustor and turbine, is studied by scholars for heat protection. [PERSON] [3] investigated the geometric construction of transition piece effected on the contours of temperature and velocity in the outlet section, by using CFD. Then, structural optimization was carried out by the Genetic Algorithms (GA). The optimized results indicated that the average inlet gas temperature and the average velocity were decreased by 2.32% and about 7.73%, respectively. [PERSON] et al. [4; 5] provided the sheath with hundreds of small impingement cooling jets can enhance the convective heat transfer coefficient by the strong forced convention coolant, which was installed over the external thermal surface of the transition piece. Both experimental and computational studies were carried out. A 1/7 th section of a circle was designed to simulate a part of the dump diffuser accommodating one and two half transition pieces. The experimental results showed that the non-sheathed case provided a 40% reduction in pressure losses when comparing with the sheathed case, but 35% increase in the maximum surface temperature difference and an increase of 13-22% in other surface temperature difference, based on the temperature difference of the bulk inlet and outlet temperature. The CFD results also identified that the addition of the sheath was advised. Xu [6] considered the coolant hole's angle and the injection angle of coolant flow effected on the heat transfer efficiency of impinging. The CFD simulation models were employed and the results indicated that heat transfer effectiveness was improved with the rising hole's inclination and injection angle, since the thermal surface was impinged by more coolant directly. They [7], also investigated that jet flow with water drop promoted impinging cooling efficiency increasing. They concluded the mass of 3 \(\times\) 10\({}^{-3}\) kg/s droplets with diameters of 5-35 \(\upmu\)m could enhance the 90% cooling effectiveness and reduce 122 K of surface temperature. For enhancing the impinging cooling efficiency, they [8] designed pin fins in the coolant chamber to increase the turbulence, and optimized the pin fin diameter and the distance.