Phenyl silicone oil has certain thermal conductivity application potential in gas turbine blade cooling system, but its thermal conductivity efficiency is affected by multiple factors such as phenyl content, temperature, filler modification and process adaptability, and needs to be comprehensively evaluated in combination with specific working conditions:

Relationship between phenyl content and thermal conductivity: The thermal conductivity of phenyl silicone oil is closely related to the phenyl content. The increase in phenyl content will increase the thermal conductivity. For example, when the phenyl content increases from 30% to 50%, the thermal conductivity increases from 0.18W/(m·K) to 0.22W/(m·K). The introduction of benzene ring structure enhances the intermolecular force and forms a tighter molecular stacking, which is conducive to the formation of heat transfer channels. However, the increase in phenyl content will also increase viscosity, which may increase the energy consumption of the pumping system.

The effect of temperature on thermal conductivity efficiency: The thermal conductivity of phenyl silicone oil shows a parabolic characteristic of first rising and then falling with temperature, and the peak value usually appears near 80°C. In the cooling system of gas turbine blades, if the operating temperature is in the peak range of thermal conductivity, phenyl silicone oil can show high thermal conductivity efficiency. However, in high temperature environment, attention should be paid to its oxidation stability, and the attenuation of thermal conductivity in long-term operation should be controlled within an acceptable range.

Improvement of thermal conductivity efficiency by filler modification: The thermal conductivity of phenyl silicone oil can be significantly improved by adding fillers such as nano-boron nitride. For example, when the content of nano-boron nitride filler reaches 30wt%, the thermal conductivity of the composite material can reach 1.8W/(m·K), which is nine times that of pure silicone oil. The interfacial coupling between filler and phenyl silicone oil can reduce phonon scattering and improve thermal conductivity. However, the uniformity of filler dispersion is a technical difficulty, which needs to be achieved through process optimization such as ultrasonic treatment or silane coupling agent modification.

Process adaptability and system efficiency: The high viscosity characteristics of phenyl silicone oil may affect its fluidity and pumping efficiency in the cooling system, and a balance needs to be achieved between thermal conductivity and rheological properties. In addition, the dielectric constant of phenyl silicone oil is relatively high, which may affect circuit performance and needs to be considered in system design. In the cooling system of gas turbine blades, the thermal conductivity of phenyl silicone oil needs to be comprehensively evaluated in combination with specific working conditions, filler modification and process adaptability.