Design of a Hydraulic Turbine Based in a Pressure Swirl Chamber using Ansys CFDCalzada, D; Uribe, A; Ronceros, J; Namay, W; Zapata, G; Raymundo, C
doi: 10.1088/1742-6596/2947/1/012012pmid: N/A
This study presents the simulation of internal flow of a hydraulic turbine using CFD based on pressure-swirl atomizer technology, typically used in combustion chambers of rocket engines. The proposed model is equipped with a swirl chamber with stabilizer included, dual manifold system and a rotor, each of these elements will be simulated to validate its functionality, prior to implementation and subsequent experimental testing. The results show that it is possible to produce the spray output jet even if there are interferences within the swirl chamber such as the rotor itself and the stabilizer. In addition, due to the tangential speeds produced within the atomizer may be viable to place a rotor to produce mechanical power. This study serves as a starting point to carry out future experimental tests to validate the generated power and efficiency of the proposed system. The results presented in the document were validated using mathematical equations and numerical simulations using the Ansys Fluent software.
Aerodynamic analysis of the hybrid wing model for an agricultural unmanned aerial vehicleHao, Jiacheng; Li, Yongping
doi: 10.1088/1742-6596/2947/1/012013pmid: N/A
In modern agriculture, unmanned aerial vehicles (UAVs) play a pivotal role in two key operational scenarios: plant protection and land mapping. In the plant protection scenario, UAVs require excellent hovering capabilities, whereas in the land mapping scenario, they need to maintain a certain level of cruising ability. To meet these diverse performance requirements, a hybrid wing design combining tilt-wing and propeller is used in the agricultural UAV. After the design of the propeller and wing was completed, Computational Fluid Dynamics (CFD) was employed to conduct aerodynamic analysis of the hybrid-wing composite model, laying the theoretical foundation for the practical application of the hybrid-wing UAV in agriculture. The findings reveal that when the UAV's pitch angle exceeds 20 degrees, an increase in propeller speed significantly alters the flow field structure around the wing, resulting in a reduction in the lift-to-drag ratio. To ensure superior aerodynamic efficiency of the wing, the propeller speed should be maintained below 1500 rpm.
Prefacedoi: 10.1088/1742-6596/2947/1/011001pmid: N/A
We are pleased to welcome you to the 2nd International Conference on Mechanical, Aerospace, and Electronic Systems (MAES 2024). The conference represent a pivotal gathering of experts, researchers, and industry leaders from around the world, showcasing the latest advancements and innovations in the fields of mechanical engineering, aerospace, electronic systems, and design and manufacturing engineering.MAES 2024 focuses on the cutting-edge trends and challenges in modern mechanical engineering, aerospace technologies, and electronic systems. As technological advancements continue to accelerate, these fields play an increasingly significant role not only in industrial and technological innovation but also in driving global sustainability. We believe the research presented at this conference will provide valuable insights and inspire further breakthroughs in these areas.This year’s conference features a wide array of innovative research, ranging from theoretical studies to practical engineering applications. The event is composed of the keynote speeches delivered respectively by Prof. Pasquale Daponte (Fellow, IEEE, University of Sannio, Italy), Prof. Zhenghong Zhu (York University, Canada), Prof. Roberto Montemanni (University of Modena and Reggio Emilia, Italy), Prof. Liang Yu (Northwestern Polytechnical University, China), and the invited talk delivered respectively by Assoc. Prof. Zili Wang (Zhejiang University, China), with the on-site technical session and the online technical session.List of Conference Committee is available in this pdf.
Effect of ring baffles in simulated flue gas denitrification via NH3-SCR in fluidized bed reactor: A CFD approachRosales, B R; Mendoza, J A
doi: 10.1088/1742-6596/2947/1/012009pmid: N/A
An unsteady Eulerian-Eulerian CFD model was employed in ANSYS FLUENT 19.2 to assess the impact of ring baffles on the hydrodynamics and NO removal efficiency in a fluidized bed reactor using the NH3-SCR process and CuO/ɤ-Al2O3 as catalyst. Initial simulations of the baffle-free (FFB) reactor were validated against experimental data focusing on bubble diameter and NO removal efficiency. Kinetic parameters were adjusted following mesh optimization to align with the experimental findings. Subsequently, simulations were conducted on baffled (BFB) reactors. The introduction of ring baffles markedly improved NO removal efficiency under identical operating conditions as the FFB. Notably, at 573.15 K, baffle configurations D7, T3, and T6 achieved removal efficiencies of 92.40%, 92.19%, and 92.36%, respectively. Even at a lower temperature of 523.15 K, these setups maintained high efficiencies indicating that baffled reactors could replicate FFB performance at reduced temperatures. The study highlights that ring baffles increase solid holdup and radial gas velocity, particularly beneath the baffles, fostering improved gas-solid interactions. Furthermore, the granular temperature was significantly enhanced by the presence of baffles.
Dynamic response analysis of natural gas boilers under seismic loadsChunxiang, Gan; Pan, Li; Jianrun, Zhang; Xi, Lu
doi: 10.1088/1742-6596/2947/1/012004pmid: N/A
This paper establishes a dynamic response analysis model of natural gas boilers composed of shell elements and beam elements. Stress, and deformation under the effects of self-weight, temperature loads, and seismic loads are used as evaluation indicators. The strength of natural gas boilers under two working conditions: hot state with low load, and full load, is analyzed. The results indicate that the boiler has high stiffness in the vertical direction, while the lower part of the rear wall is a relatively weak point in terms of stiffness. This provides a reference for further optimization of the boiler structure. Additionally, it was found that the first natural frequency of the boiler decreased by 36.7% and 38.1% compared to the static and free modes, respectively, after applying thermal loads, indicating a significant reduction in the stiffness of the boiler when heated.
High dynamic magnetic transport system for substrate alignmentDenkena, Berend; Klemme, Heinrich; Zhang, Jingcai
doi: 10.1088/1742-6596/2947/1/012003pmid: N/A
Optical waveguides can be manufactured using transfer processes. Therefore, the substrate needs to be transported and precisely aligned between different process steps. To achieve high productivity, a high dynamic transport system is necessary. However, for conventional transport systems, the dynamic positioning accuracy is limited due to friction of the contact-based guides. Thus, a friction-free transport system has the potential to achieve a higher dynamic positioning accuracy. In this paper a novel friction-free transport system with magnetic guide is presented. Its impressive load capacity and high dynamics have been verified through experiments. Based on the experimental data, the transport system is capable of providing loads of up to approximately 2000 N to meet printing requirements and a bandwidth of 75.0 Hz was achieved, which is 125% higher than the contact-based device.
Interfacial damage mechanical characterization and evolution model of EB-PVD thermal barrier coatings based on 3D-DIC technologyLv, Z Z; Hu, D Y; Liu, H Y; Jing, F L; Zhao, Y; Wang, R Q
doi: 10.1088/1742-6596/2947/1/012001pmid: N/A
Thermal barrier coatings (TBCs), owing to their excellent properties, are widely used in aero-engines to enhance efficiency and extend lifespan. In this paper, a novel uniaxial compression-based mechanical characterization model for TBCs interface damage was proposed, which is applicable to a range of buckling modes. Furthermore, with the aid of threedimensional digital image correlation (3D-DIC) technology, the exfoliation criterion of TBCs in room temperature compression tests was determined, and damage quantification was achieved in conjunction with the damage characterization model. The results indicate that total damage consists of oxidative, cyclic, and sintering damages, and respective damage evolution models were established. Finally, the total interface damage evolution model of TBCs was constructed based on the principle of nonlinear accumulation of damage The results demonstrate that the error between the measured and calculated damage values is less than ±10%, indicating high accuracy.
Analysis of vibration due to combined misalignments in loaded spur gear systemsTuiran, R.; Ruge, A.; Águila, H.; Maury, H.
doi: 10.1088/1742-6596/2947/1/012008pmid: N/A
This study investigates a single stage spur gear transmission system subjected to combined misalignments, such as parallel (radial and axial) and angular (yaw) misalignments, under varying load conditions. Two load levels were analysed: 0.1 Nm for "no load" and 1.2 Nm for "loaded" conditions. The input variables are combined misalignments and reaction loads, while the output variable is the vibration measurement taken at the bearing supports. These measurements were used to assess the effect of misalignment and load on the vibrational behaviour of the system. The test bench used for the experimental runs consists of a 2 hp motor and a hydraulic system that allows the reaction torques to be controlled. The results show that although the acceleration values vary under different load conditions, the overall trend remains consistent as long as no significant deformation occurs in the gears. Furthermore, the type of misalignment that most influences the variation in acceleration is yaw misalignment.
Structural design and LCF lifetime prediction of simulating specimen for the tenon tooth of nickel-based single crystal turbine bladeLi, M R; Wang, R Q; Zhang, B; Zhao, Y; Hu, D Y; Mao, J X
doi: 10.1088/1742-6596/2947/1/012011pmid: N/A
In this study, the structural design, low-cycle fatigue (LCF) experiments and lifetime prediction of simulating specimens for the tenon tooth chamfer of a nicked-based single crystal turbine blade were conducted. Firstly, a crystal plasticity constitutive analysis of the turbine blade was performed to identify hotspots under in-service operating conditions. Then, ensuring consistency in geometric structure and lifetime-related parameter, a simulating specimen was designed. Comparing the finite element simulation results of the stress concentration area of the simulating specimen and the tenon tooth chamfer of the turbine blade, the error in the lifetime-related parameter was less than 4.75%, demonstrating that the designed simulating specimen achieved lifetime equivalence for the tenon tooth chamfer. Moreover, a modified method for determining critical distance that considers the influence of notch size was established based on the theory of critical distance (TCD). By combining this method with the slip-based damage model, the LCF lifetime of notched specimens and simulating specimens was accurately predicted.
Design and Performance Assessment of a Combined Grater and Milk Extraction Mechanism for Coconut MeatAtienza, A H; Arce, J L; Banawa, K I; Rabanal, M C T
doi: 10.1088/1742-6596/2947/1/012007pmid: N/A
Coconut meat processing in the Philippines is considered to be labor and energy intensive. Using traditional methods such as grating and milk extraction consumes more time, with safety issue with the operators and low efficiency. This study was aimed to design and fabricate an innovative machine that will solve the problems of small - scale coconut industry in the Philippines with the help of engineering applications. The study aimed to increase the time efficiency of the coconut milking process by combining the coconut grating and milk extraction in one mechanism and improving the existing design of the coconut grating mechanism. Another objective was to increase the overall efficiency by using a proper milk extractor mechanism. Lastly, the study aimed to improve the existing design of the coconut grating mechanism to lessen the occurrence and possibility of having physical injuries from using the said mechanism. The target beneficiary of the study was the market of the coconut industry in San Pablo City, Laguna. One horsepower motor was used to run the combined mechanisms. Welding, milling, grinding, drilling, boring was done to fabricate the prototype. A screw type compressor for coconut milking process was used to increase the efficiency of the milking process. An emergency brake was provided to ensure the safety of the workers. Belts, pulleys, bearings, coconut grater, sprockets, screen, bolts and screws were used on the prototype. After testing, it was found out that there is reduction of 15.63% in time processing the coconut compared to the traditional piston press that was used mostly in the local market. It was also observed to have an average efficiency of 47.5% with screw press efficiency of 32.5%.