Precise and rapid evaluation of the temperature field in tripled-glazed insulating glass units(TIGUs)under intense solar radiation is crucial for the thermal-resistant design of glass curtain wall systems(GCWSs)and as...Precise and rapid evaluation of the temperature field in tripled-glazed insulating glass units(TIGUs)under intense solar radiation is crucial for the thermal-resistant design of glass curtain wall systems(GCWSs)and assessments of building thermal environments.However,available empirical data,traditional T_(sol-air) method,and numerical simulations are inadequate in accurately calculating the thermal behavior of this emerging energy-efficient building material,particularly for the complex heating effects of direct and diffuse solar radiation and the thermal convection of cavity gas in multilayer glazing systems.This study presents a comprehensive thermal analysis of TIGUs using a refined thermo-fluid-structure interaction(TFSI)finite element(FE)model that accounts for heat conduction,convection(both external and within cavities),and radiative transfer.The improved model,implemented in ANSYS and incorporating D-O radiation,k-epsilon(RNG)viscous,and energy models,demonstrates superior agreement with experimental results and the WINDOW software(MAPE=2.45%),which addresses key limitations of existing standards and the T_(sol-air) method.A parametric study based on meteorological data from ten representative cities was conducted,identifying the influence of outdoor temperature,direct radiation,and diffuse radiation on the TIGU temperature field,with their effects quantitatively characterized by sensitivity coefficients a,b,and C.The concept of“peak region”was introduced to intuitively describe the non-monotonic thermal behavior under strong solar radiation.For the widely used configuration(6+12Air+6+12Air+6 mm),fitted equations were derived using least squares and Lagrange interpolation methods,with R^(2)>0.99,enabling efficient estimation of temperature distributions under long-term climatic conditions.展开更多
Non-contacting finger seals represent an advanced non-contacting and compliant seal in gas turbine sealing technology.This paper proposes a new structure of noncontacting finger seals with double interlocking pads.The...Non-contacting finger seals represent an advanced non-contacting and compliant seal in gas turbine sealing technology.This paper proposes a new structure of noncontacting finger seals with double interlocking pads.The numerical analysis model based on the thermo-fluid-structure coupling method for the new type finger seal was established.The influence of working conditions on leakage of the seal was studied and compared with the single padded non-contacting finger seal.The results show that the interface between the bottom of the finger pad and rotor surface is the main leakage path that forms the gas film with obvious variations of pressure and flow velocity.Under high temperature and high pressure operating conditions,the hydrodynamic effect of the gas film is enhanced,and lifting force is significantly improved.The deformation of fingers is composed of elastic deformation and thermal deformation.At room temperature,the deformation of fingers is mainly elastic deformation and points to the center of the rotor,which reduces the gas film clearance.The deformation of fingers at high temperature and high pressure creates a circumferentially convergent gap between the bottom of the pad and the rotor,which is beneficial to improve the loading capacity and to reduce leakage of the seal.Compared with the typical single padded noncontacting finger seal,the double interlocking padded finger seal proposed in this paper reduces the leakage factor by about 37%,which provides an advanced seal concept with the potential to improve sealing performance under high temperature and high pressure working conditions.展开更多
基金funding from the Key Research and Development Program of Shaanxi under grant No.2024SF-ZDCYL-05-11the National Key Research and Development Program of China under grant No.2022YFC3801800.
文摘Precise and rapid evaluation of the temperature field in tripled-glazed insulating glass units(TIGUs)under intense solar radiation is crucial for the thermal-resistant design of glass curtain wall systems(GCWSs)and assessments of building thermal environments.However,available empirical data,traditional T_(sol-air) method,and numerical simulations are inadequate in accurately calculating the thermal behavior of this emerging energy-efficient building material,particularly for the complex heating effects of direct and diffuse solar radiation and the thermal convection of cavity gas in multilayer glazing systems.This study presents a comprehensive thermal analysis of TIGUs using a refined thermo-fluid-structure interaction(TFSI)finite element(FE)model that accounts for heat conduction,convection(both external and within cavities),and radiative transfer.The improved model,implemented in ANSYS and incorporating D-O radiation,k-epsilon(RNG)viscous,and energy models,demonstrates superior agreement with experimental results and the WINDOW software(MAPE=2.45%),which addresses key limitations of existing standards and the T_(sol-air) method.A parametric study based on meteorological data from ten representative cities was conducted,identifying the influence of outdoor temperature,direct radiation,and diffuse radiation on the TIGU temperature field,with their effects quantitatively characterized by sensitivity coefficients a,b,and C.The concept of“peak region”was introduced to intuitively describe the non-monotonic thermal behavior under strong solar radiation.For the widely used configuration(6+12Air+6+12Air+6 mm),fitted equations were derived using least squares and Lagrange interpolation methods,with R^(2)>0.99,enabling efficient estimation of temperature distributions under long-term climatic conditions.
文摘Non-contacting finger seals represent an advanced non-contacting and compliant seal in gas turbine sealing technology.This paper proposes a new structure of noncontacting finger seals with double interlocking pads.The numerical analysis model based on the thermo-fluid-structure coupling method for the new type finger seal was established.The influence of working conditions on leakage of the seal was studied and compared with the single padded non-contacting finger seal.The results show that the interface between the bottom of the finger pad and rotor surface is the main leakage path that forms the gas film with obvious variations of pressure and flow velocity.Under high temperature and high pressure operating conditions,the hydrodynamic effect of the gas film is enhanced,and lifting force is significantly improved.The deformation of fingers is composed of elastic deformation and thermal deformation.At room temperature,the deformation of fingers is mainly elastic deformation and points to the center of the rotor,which reduces the gas film clearance.The deformation of fingers at high temperature and high pressure creates a circumferentially convergent gap between the bottom of the pad and the rotor,which is beneficial to improve the loading capacity and to reduce leakage of the seal.Compared with the typical single padded noncontacting finger seal,the double interlocking padded finger seal proposed in this paper reduces the leakage factor by about 37%,which provides an advanced seal concept with the potential to improve sealing performance under high temperature and high pressure working conditions.
