Experimental investigation of a flow-oriented throttleable injector designed for throttleable hybrid rocket motor

Zhao, Zeng; Cai, Guobiao; Zhao, Bo; Liu, Yu-Fei; Yu, Nanjia

doi:10.1016/j.actaastro.2021.12.024

Cited by 18 publications

(3 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Meng et al [143] have studied the effects of adding aluminum and aluminum hydride to HTPB when using 95% H 2 O 2 . Zhao et al [144] have worked with 98% H 2 O 2 and PE, exploring thrust throttling. This was achieved by combining a flow-oriented throttleable injector cooperating with a cavitating controllable venturi.…”

Section: Hydrogen Peroxidementioning

confidence: 99%

Test Activities on Hybrid Rocket Engines: Combustion Analyses and Green Storable Oxidizers—A Short Review

2023

View full text Add to dashboard Cite

Hybrid rocket engines (HREs) offer a low-cost, reliable, and environmentally friendly solution for both launch and in-space applications. Hybrid propellants have been identified as green thanks to their use of non-toxic, non-carcinogenic oxidizers. Of particular relevance are storable oxidizers, namely high-concentration (≥90 wt.%) hydrogen peroxide (HP, H2O2) and nitrous oxide (N2O). This work provides a survey of experimental activities based on H2O2 and N2O for hybrid rocket propulsion applications. Open literature data are completed with original thermochemical calculations to support the discussion.

show abstract

Section: Hydrogen Peroxidementioning

confidence: 99%

Test Activities on Hybrid Rocket Engines: Combustion Analyses and Green Storable Oxidizers—A Short Review

2023

View full text Add to dashboard Cite

show abstract

“…With dense trafc fow and intricate route structures, it is prone to becoming a bottleneck in air trafc operations [1]. When airspace resources are strained and capacities reach saturation, the escalating confict between terminal airspace capacity and fight volumes leads to congestion, manifesting as fight delays [2,3]. A comprehensive understanding of congestion's dynamic evolution in terminal airspace is pivotal for formulating efective air trafc control measures, optimizing airspace resources, and alleviating operational pressures within the airspace.…”

Section: Introductionmentioning

confidence: 99%

Optimized ST-Moran’s I Model for Characterizing the Dynamic Evolution of Terminal Airspace Congestion

Chen,

Zhu,

Zou

et al. 2024

Journal of Advanced Transportation

View full text Add to dashboard Cite

This study aims to unveil the spatiotemporal evolution of congestion within terminal airspace, offering an in-depth analysis of congestion concerns to effectively utilize airspace resources and devise targeted control strategies, thereby enhancing airspace operation safety and efficiency. Initially, converting segment flow rates into equivalent speeds serves as a quantitative benchmark for operational status. Subsequently, an enhanced version of the ST-Moran’s I index model, specifically tailored to terminal airspace, is developed by incorporating improvements across spatial weight matrices, standard state parameters, and temporal dimensions. Validating this model with actual operational data from Chengdu’s terminal airspace, the research demonstrates significant advancements. Compared to conventional models, the proposed model enhances recognition rates for congestion in spatial and temporal dimensions by 62.5% and 43.61%, respectively. Congestion within terminal airspace predominantly occurs at the intersection of departure-climb and approach-departure segments, exhibiting evident spatiotemporal migration behavior. The proposed model accurately delineates the spatiotemporal characteristics of segment congestion, offering support for tailored congestion management strategies.

show abstract

“…Additive manufacturing technology is extensively used in the production and processing of complex aerospace components made from high-temperature alloys [1,2], including small fuel injectors in ramjet engines [3,4]. The demanding operating conditions of these components necessitate enhanced durability, and the quality of the flow channels, particularly those with large aspect ratios, critically influences their lifespan.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Process Parameters for Abrasive Water Jet Internal Channel Surfaces

Liu,

Hou,

Wang

et al. 2024

Preprint

View full text Add to dashboard Cite

To address the issues of surface roughness and spheroidization in the internal channels of additively manufactured high-temperature alloys with a large aspect ratio, a study on abrasive water jet polishing using synthetic silicon carbide was conducted. A full factorial experimental design was employed to explore the effects of three sets of process parameters: polishing pressure, abrasive concentration, and polishing time, on the quality of the channel surfaces. Additionally, the finishing effects of two different abrasive grain sizes under these parameters were compared. A generalized factorial regression model was constructed, which indicated that the significant factors affecting the surface quality of the channels were, in order, pressure, concentration, and time. An analysis of the process parameters and measurement data was carried out, determining the optimal polishing parameters for the internal channels. The surface characteristics of the runners were analyzed using surface morphology. The experiments clearly enhanced the finishing and surface quality of internal runners in additively manufactured high-temperature alloys, effectively solving the problem of spheroidization that occurs during the printing process of additive metal components.

show abstract

Experimental investigation of a flow-oriented throttleable injector designed for throttleable hybrid rocket motor

Cited by 18 publications

References 23 publications

Test Activities on Hybrid Rocket Engines: Combustion Analyses and Green Storable Oxidizers—A Short Review

Test Activities on Hybrid Rocket Engines: Combustion Analyses and Green Storable Oxidizers—A Short Review

Optimized ST-Moran’s I Model for Characterizing the Dynamic Evolution of Terminal Airspace Congestion

Optimization of Process Parameters for Abrasive Water Jet Internal Channel Surfaces

Contact Info

Product

Resources

About