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Inventions, Volume 9, Issue 5

2024 October - 20 articles

Cover Story: To alleviate the adverse effects of shock boundary layer interaction, active and passive control strategies have been explored. This research investigates the behavior of passive perforated plates applied to NACA0012 airfoils in cascade configurations. Six cascade setups, including a “no control” configuration, were manufactured with orifice sizes from 0.5 to 1.2 mm. A high-speed wind tunnel, with Schlieren optics and wall static pressure sensors, was used to analyze shock wave pattern changes. 3D numerical simulations using Ansys FLUENT continuously revealed that the perforated plates altered the shock structure, weakening a strong normal shock into an X-type shock. A 1% total pressure loss occurred, balancing reduced shock losses with increased viscous losses. Further research on geometric optimization is needed to enhance outcomes. View this paper
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Articles (20)

  • Article
  • Open Access
3 Citations
4,416 Views
23 Pages

21 October 2024

The heat transfer surfaces of heat exchangers are usually made of metals which may suffer from severe corrosion. When corrosive fluids are present, highly corrosion-resistant metals, graphite or ceramics are used, resulting in high costs. This study...

  • Article
  • Open Access
1 Citations
1,959 Views
23 Pages

Effects of Perforated Plates on Shock Structure Alteration for NACA0012 Cascade Configurations

  • Mihnea Gall,
  • Oana Dumitrescu,
  • Valeriu Drăgan and
  • Daniel-Eugeniu Crunțeanu

To alleviate the shock boundary layer interaction adverse effects, various active or passive flow control strategies have been investigated in the literature. This research sheds light on the behavior of perforated plates as passive flow control tech...

  • Article
  • Open Access
2,075 Views
20 Pages

This paper explores the application of conceptual hydrological models in optimizing the operation of hydroelectric power plants (HPPs) in steppe regions, a crucial aspect of promoting low-carbon energy solutions. The study aims to identify the most s...

  • Article
  • Open Access
1,766 Views
29 Pages

29 September 2024

This study emphasizes the urgent need for systems that monitor the operational states of primary electrical equipment, particularly power transformers. The rapid digitalization of and increasing data volumes from substations, coupled with the inabili...

  • Article
  • Open Access
1 Citations
2,092 Views
24 Pages

Operating Characteristics of a Wave-Driven Plasma Thruster for Cutting-Edge Low Earth Orbit Constellations

  • Anna-Maria Theodora Andreescu,
  • Daniel Eugeniu Crunteanu,
  • Maximilian Vlad Teodorescu,
  • Simona Nicoleta Danescu,
  • Adrian Stoicescu,
  • Alexandru Cancescu and
  • Alexandru Paraschiv

29 September 2024

This paper outlines the development phases of a wave-driven Helicon Plasma Thruster for cutting-edge Low Earth Orbit (LEO) constellations. The two-stage ambipolar electric propulsion (EP) system combines the efficient ionization of an ultra-compact h...

  • Article
  • Open Access
6 Citations
5,552 Views
22 Pages

Energy Analysis of Standardized Shipping Containers for Housing

  • Elena Arce Fariña,
  • Mirela Panait,
  • José María Lago-Cabo and
  • Raquel Fernández-González

27 September 2024

Shipping containers that remain in ports after exporting or importing products cause an environmental and logistical problem. Transporting them to the port of origin is costly; therefore, some of them are stored in the regions of destination. Recycli...

  • Article
  • Open Access
11 Citations
3,864 Views
18 Pages

Innovative Design of a Continuous Ultrasound Bath for Effective Lignocellulosic Biomass Pretreatment Based on a Theorical Method

  • Paula Andrea Ramirez Cabrera,
  • Alejandra Sophia Lozano Pérez and
  • Carlos Alberto Guerrero Fajardo

26 September 2024

Ultrasonic pretreatment is a crucial step in the bioconversion of lignocellulosic biomass, such as peapods, into valuable products. Ultrasonic pretreatment is a highly effective physical method that utilizes ultrasonic waves to enhance various proces...

  • Article
  • Open Access
1 Citations
3,098 Views
24 Pages

Hydraulic Design of an Ultracompact Liquid Methane–Liquid Oxygen Turbopump for a Mid-Scale Thruster for Upper Stage Application

  • Alexandru-Claudiu Cancescu,
  • Daniel-Eugeniu Crunteanu,
  • Anna-Maria Theodora Andreescu,
  • Simona-Nicoleta Danescu and
  • Valeriu Dragan

25 September 2024

As space missions proliferate and the payload requirements increase, the environmental impact of thrusters can no longer be considered negligible. Therefore, less impactful fuels such as methane are starting to be considered for launchers. In this pa...

  • Article
  • Open Access
2 Citations
3,500 Views
25 Pages

20 September 2024

It is crucial for both traffic management organisations and individual commuters to be able to forecast traffic flows accurately. Graph neural networks made great strides in this field owing to their exceptional capacity to capture spatial correlatio...

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Inventions - ISSN 2411-5134