Browsing Aerospace, Mechanical & Electronic Engineering ITC by Issue Date

Now showing items 21-36 of 36

    • CFD-CRN Study of NOx formation in a high-pressure combustor fired with lean premixed CH4 / H2 - air mixtures 

      Vashishtha, Ashish; Yousefian, Sajjad; Goldin, Graham; Frojd, Karin; Jella, Sandeep; Bourque, Gilles; Monaghan, Rory F.D. (The American Society of Mechanical Engineers, 2021-01)
      The main motivation of this study is to investigate detailed NOx and CO formation in high-pressure dump combustor fired with lean premixed methane-air mixture using CFD-CRN hybrid approach. Further, this study is extended ...

    • An Open-Source Testbed to Visualise ICS Cybersecurity Weaknesses and Remediation Strategies – A Research Agenda Proposal 

      Ó Briain, Diarmuid; Ekisa, Conrad; Kavanagh, Yvonne (IEEE, 2021-07)
      Industrial Control Systems (ICS) are responsible for the control of several processes in various critical infrastructure deployments ranging from energy, power and water utilities, to manufacturing sectors such as ...

    • Study of direct gas injection into stagnation zone of blunt nose at hypersonic flow 

      Harmon, Peter; Vashishtha, Ashish; Callaghan, Dean; Nolan, Cathal; Deiterding, Ralf (American Institute of Aeronautics and Astronautics, 2021-07-28)
      Direct gas injection in the shocked or compressed region has importance in many applications from drag control to ignition and pressure gain combustion. This numerical study is focused on direct light gas injection into ...

    • Novel mechanism of instability control using tapered spike in hypersonic flow 

      Vashishtha, Ashish; Khurana, Shashank (American Institute of Aeronautics and Astronautics, 2021-08-02)
      A forward facing spiked blunt nose in high-speed flows is associated with pulsating flow behavior of varying amplitudes depending on spike-nose and length, the forebody geometry and flow conditions. A tapered spike has ...

    • Particle Acceleration Through Coaxial Co-Flow Nozzles for Cold Spray Applications 

      Kumar Sharma, Amit; Vashishtha, Ashish; Callaghan, Dean; Nolan, Cathal; Bakshi, Srinivasan; Kamaraj, M.; Raghavendra, Ramesh (ITSC 2022 Thermal Spray Conference and Exposition, 2022)
      The present study numerically investigates the effectiveness of co-flowing nozzle for cold spray application. A convergent - divergent axi-symmetric nozzles have been simulated with high-pressure nitrogen flow. The particle ...

    • Oblique Detonation Wave Control with O3 and H2O2 Sensitization in Hypersonic Flow 

      Vashishtha, Ashish; Panigrahy, Snehasish; Campi, Dino; Callaghan, Dean; Nolan, Cathal; Deiterding, Ralf (MDPI journals, 2022-06-04)
      This numerical study investigates the effects of adding a small amount of ignition promoters for controlling the wedge-induced oblique shock wave (OSW) to oblique detonation wave (ODW) transition in a premixed hydrogen–air ...

    • Detached eddy simulation of unsteady flow over a frontal cavity 

      Salunke, Samruddhi; Shinde, Suryapratap; Singh, Ishika; Sahoo, Devabrata; Vashishtha, Ashish (American Institute of Aeronautics and Astronautics, 2023)
      Frontal cavity consists of complex unsteadiness which causes bow shock instabilities when the body is moving at supersonic or hypersonic speed through a fluid. These complex unsteady flow fields are an important practical ...

    • An assessment of radiation models utilized in CFD for thermal and fluid analysis in interior building spaces with large glazing 

      Samuel, Yona Arike; Confrey, Thomas; Vashishtha, Ashish; Callaghan, Dean; Nolan, Cathal (AIP Publishing, 2023)
      This paper investigates the effects of using the S2S and the DO method in the CFD simulation of a cavity to identify a convenient model for simulating radiative heat transfer. A 3D model for an office room fitted with a ...

    • Numerical study of oblique detonation wave control for fuel blends 

      Kore, Rushikesh; Vashishtha, Ashish (2023)
      The current study is motivated to develop control strategies for oblique detonation wave formation on a finite length wedge in a premixed methane-air mixture. The effectiveness of hydrogen blends (0 - 100%) to methaneair ...

    • Numerical investigation of the impact of injectors location on fuel mixing in the hifire 2 scramjet combustor 

      Palateerdham, S.K.; Phaneendra Peri, L.N.; Ingenito, A.; Vashishtha, A. (2023)
      In scramjets, the position and direction of the injectors plays a crucial role for fuel/air mixing and combustion efficiency. Fuel injection is still a potential topic of research to be addressed, in fact an effective ...

    • Unsteady DSMC Simulation of blunt nose with spike at hypersonic rarefield flows 

      Ravuri, Nishita; Scully, Stephen; Vashishtha, Ashish (2023-03-29)
      To design an efficient ram-air intake for an air-breathing propulsion system for VLEO (Very-Low) / SLEO (Super Low) Earth Orbit satellites requires consideration of the unsteady effects in the hypersonic low-density or ...

    • Mach number dependence of flow instability around a spiked body 

      Vashishtha, Ashish; Khurana, Shashank (AIP Publishing, 2023-05-05)
      A forward-facing aerospike have been identified as a passive flow control device for enhancing the aerodynamic efficiency and reducing the heat transfer in high-speed flows. In addition, it has been reported that the ...

    • A concept of aerospike nozzle for cold spray additive manufacturing: towards a potential solution for preventing the issue of clogging 

      Raoelison, Rija Nirina; Msolli, Sabeur; Deng, Sihao; Vashishtha, Ashish; Callaghan, Dean; Zaim-Mounajed, Wassim; Zhang, Teng; Padayodi, Essolé; Sagot, Jean-Claude; Raghavendra, Ramesh (ASM International, 2023-05-22)
      The clogging, a frequent gas passage deformation phenomenon because of powder accumulation on inner nozzle wall, is a major issue in long duration Cold Spray (CS) operations and a major challenge for Cold spray technology ...

    • Investigation of a modified circular nozzle for cold spray applications 

      Sharma, Amit Kumar; Vashishtha, Ashish; Callaghan, Dean; Bakshi, Srinivasan Rao; Kamaraj, M.; Raghavendra, Ramesh (ASM International, 2023-05-22)
      The current work numerically evaluates the efficacy of a coflowing nozzle for cold spray applications with the aim to mitigate nozzle clogging by reducing the length of its divergent section. The high-pressure nitrogen ...

    • Studying the influence of aluminium in ADN/HTPB-based solid propellants 

      Kore, Rushikesh; Nagendra, Kumar; Vashishtha, Ashish (American Institute of Aeronautics and Astronautics, Inc., 2024-01)
      Ammonium Dinitramide (ADN) combustion has been the subject of great interest over the past few years due to consideration as a green oxidizer in solid rocket propellants. This study is focused on predicting the flame ...

    • Numerical studies of ram-air Intake for near-earth satellites 

      Ravuri, Nishita; Scully, Stephen; Vashishtha, Ashish (American Institute of Aeronautics and Astronautics, Inc., 2024-01)
      The operation of satellites in Earth orbits with altitudes lower than 450 km involves dealing with rarefied atmosphere environment. To compensate for the aerodynamic drag present in this low-density atmosphere, satellites ...