March 09 ~ 10, 2024, Virtual Conference
Mehdi BOUDOUH1, and Brahim Elkhalil HACHI1 Mohamed HABOUSSI2, 1Laboratory of Development in Mechanic and Materials (LDMM), Ziane Achour University, Djelfa, Algeria, 2Laboratory of Process and Materials Sciences (LSPM), Sorbonne Paris Nord University, UPR 3407 CNRS, F-93430, Villetaneuse, France
The proposed study constitutes a contribution to the establishment of a methodology and a model making it possible to identify the thermomechanical behavior of an air-cooled blade sector. To analyze this problem and highlight the causes of a failure observed on a turbine, we first carried out the 3D design of blade models with a four-digit series NASA profile. Then, we identified the actual operating parameters of the machine. The actual operating parameters of the machine. The thermomechanical behavior of the blade sector, stressed by the thermal loading under operating conditions, is analyzed using a finite element calculation code. This study constitutes a fairly important contribution to the modeling of the blade for the finite element analysis of the influence of the thermomechanical effect. It makes it possible to determine the stresses and deformations in the gas turbine blade. The maximum values of the Von Mises stresses were determined in order to assess the behavior of the material. Comparing the Von Mises stresses of both static and thermomechanical studies also allowed us to see the maximum and minimum deformation. The results are very encouraging from the design study of an aluminum blade, and the modeling in thermomechanical terms, the simulation protocol gives logical and coherent answers.
gas turbine, blade, thermomechanics, stress, displacement &Strain.
C.A. Popoola and O.S. Onyekwere, Department of Chemical Engineering, Federal University Wukari, Nigeria
This study investigated effect of titanium oxide nanoparticle additive on the tribological properties of sandbox bio-lubricant. Titanium oxide nanoparticle-enriched sandbox bio-lubricant was developed by adding varying concentrations of the nanoparticle to the sandbox lubricant. Central composite design of response surface methodology was used to set up experimental parameters in order to minimize the numbers of experiments. The parameters values used for the evaluation were: load (2 N, 5 N, 8 N), speed (150 rpm, 200 rpm, 250 rpm) and nanoparticle concentration (0 wt%, 0.75 wt%, 1.50 wt%). Effects of these values on wear rate, friction coefficient and flash temperature parameter were evaluated. The lowest values of coefficient of friction and wear rate were obtained at a speed of 200 rpm and concentration of 0.75 wt% with 2 N load, while the highest value of flash temperature parameter was obtained with 8 N load at the same speed and concentration. The optimal combinations of parameters for minimum coefficient of friction and wear rate as well as maximum flash temperature were: 8.0N load, 199.4949 rpm speed and 0.7121wt% concentration. The overall results revealed that titanium oxide nanoparticle added to sandbox lubricant improved the tribological properties of the lubricant by increasing the anti-friction and anti-wear capacity of the lubricant. This showed the potential of titanium oxide nanoparticle as additive for bio-lubricant production.
Sandbox seed oil, titanium oxide nanoparticle , tribology, bio-lubricant, lubrication.
Lu Wang1, 2, Xiaoyun Hu1, 2, Hansong Li1, 2, Jinhao Wang1, 2 , 1College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China, 2National Key Laboratory of Science and Technology on Helicopter Transmission, Nanjing, 210016, China
Electrochemical discharge machining (ECDM) is a composite technology that combines electric discharge machining (EDM) with electrochemical machining (ECM), and it can be used for the processing of honeycomb seal structures. In this study, fluid dynamic simulation and experimental study were conducted. A vortex effect was observed, hindering the electrolyte flow. Compared to other fluid supply methods, a bilateral fluid supply can reduce vorticity and velocity, weakening the vortex effect. According to the result and the current signals after discrete wavelet transformation (DWT), the higher voltage and flow rate can increase total energy and exacerbate the vortex effect respectively, and strengthen the EDM and ECM effect, resulting in more processing depth, over corrosion depth, and molten product height. However, the higher electrolyte concentration can reduce the EDM effect, and enhance the ECM effect, which leads to more over corrosion depth and less processing depth and the molten product height.
Electrochemical discharge machining, Honeycomb seal structure, Surface quality, Energy distribution, Material removal rate.