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Email Address Subscribe Categories General – Turbomachinery Analysis Design Optimization Redesign Industry Academic Aerospace & Space Exploration Appliances & Medical Devices Automotive, Train & Marine Clean Technology Government & Defense HVAC & Refrigeration Oil & Gas Power Generation Machine Type Compressor Fan Pump Turbine Turbocharger Turbopump Optimization of the Axial Turbine Flow Paths E-Book Recent Posts What Exactly is a Mixed-Flow Turbomachine? Holistic Modeling of Energy Conversion & Propulsion Systems using 0D – 3D Approaches Gas Turbine Units and Their Impact on the Environment – Part 2 SoftInWay Year-End Review – 2023 Edition Gas Turbine Units and Their Impact on the Environment – Part 1 Automated 1D Analysis of Stall Inception in Multistage Compressors Axial or Radial? Selecting the Ideal Turbomachinery Configuration Considering Rotor Dynamic Constraints Heat Pump Applications and Modern Design Strategies Critical Speed Maps in Turbomachinery Turbomachinery Design Strategies & Tips: How to Choose Between an Axial or Radial Configuration What Exactly is a Mixed-Flow Turbomachine? Posted Thursday, March 28, 2024 Monday, May 6, 2024 by Fengting Du A review of the literature on mixed-flow turbomachinery reveals a surprising variation in the ways engineers use the term ‘mixed-flow turbomachine’. In particular, two main conceptions of the term stand out. On the first conception, ‘mixed-flow’ refers to the union of axial and radial flow directions into one diagonal flow, resulting in what some call diagonal turbomachines . In the second conception, ‘mixed-flow’ refers to the combination of distinct elements where the flow is axial in some and radial in others. This kind of machine is sometimes called an axial-radial combined turbomachine . Diagonal turbomachines utilize a flow angle that is between axial and radial and may be considered mere variants of radial machines. The diagonal flow angle allows these machines to enjoy some benefits from both axial and radial flows. In contrast, axial-radial combined turbomachines represent a strategic integration of both axial and centrifugal designs. In light of the ambiguous use of the term, one might reasonably wonder what truly defines a mixed-flow turbomachine. Is it the convergence of flow directions, the strategic blending of different machine types, or a fusion of design elements? Figure 1. 3D view of a mixed-flow (diagonal) compressor in AxSTREAM Diagonal turbomachines are characterized by their flow’s meridional exit angle, which ranges between 0 and 90 degrees. This geometry enables the flow to exit closer to an axial direction, with the exit mean radius greater than that of the inlet. In mixed-flow compressors, this design facilitates higher efficiencies within a constrained cross-sectional area. This advantageous setup addresses a critical need in various applications like unmanned aerial vehicles (UAVs), where the integration of gas turbines demands superior performance within limited spatial constraints as well as a high thrust-to-weight ratio. Read More Share this: Click to share on Twitter (Opens in new window) Click to share on Facebook (Opens in new window) Click to share on LinkedIn (Opens in new window) Click to share on WhatsApp (Opens in new window) Holistic Modeling of Energy Conversion & Propulsion Systems using 0D – 3D Approaches Posted Thursday, February 1, 2024 Thursday, February 1, 2024 by Serhan Memuk The fields of energy conversion and propulsion systems stand at the forefront of technological innovation, driving advancements in transportation, aerospace, and sustainable energy solutions. In the quest for optimized performance and efficiency, researchers are increasingly turning to holistic modeling approaches that bridge the gap between 0D and 3D simulations. The integration of simulation levels offers a more comprehensive understanding of complex systems by combining simplified, yet accurate, 0D models with highly detailed 3D representations. In this exploration of holistic modeling, we’ll look into how combining 0D and 3D perspectives is essential for designing, analyzing, and optimizing various systems such as steam power plants and rocket propulsion. Holistic modeling combines simplified 0D models with detailed 3D simulations, allowing engineers and scientists to get a complete picture of how different components interact within systems. This approach considers both the big picture and the finer details, providing a more faithful view of how systems work in the real world. Figure 1 Holistic Modeling Framework in the AxSTREAM Platform Energy conversion and propulsion systems operate as thermodynamic cycles, which engineers must design, evaluate, and optimize. The engineer’s process requires simulation of how a new or existing system and its components perform under different conditions. However, given the sheer multitude of components involved in such cycles, software tools are absolutely necessary for studying cycle operation and component interaction. AxSTREAM System Simulation is SoftInWay’s software tool that enables engineers to study and optimize cycles using methods such as Design of Experiment and Monte Carlo . The platform provides a virtual lab where one can tweak and test different setups to find the most desirable ones, both at steady states and in transient conditions. Read More Share this: Click to share on Twitter (Opens in new window) Click to share on Facebook (Opens in new window) Click to share on LinkedIn (Opens in new window) Click to share on WhatsApp (Opens in new window) Gas Turbine Units and Their Impact on the Environment – Part 2 Posted Tuesday, January 9, 2024 Tuesday, January 9, 2024 by Alexander Yudin Part 1 As discussed in Part 1 of this blog, Part Two will delve into various development strategies aimed at reducing emissions and enhancing gas turbine performance. Several approaches are currently being explored or employed to mitigate exhaust gas toxicity, as outlined below: Injection of water or steam into the combustion chamber of a gas turbine unit to boost power and reduce NOx content. Creation of low-emission multi-zone combustion chambers with variable geometry, pneumatic nozzles, and special...