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    Passive Rotor Noise Reduction Through Axial and Angular Blade Spacing Modulation by Chingiz Arystanbekov, Altay Zhakatayev, Basman Elhadidi

    Published 2025-02-01
    “…Additionally, the study accounts for the effect of the blade tip Mach number, concluding that a tip Mach number ranging between <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>0.7</mn></mrow></semantics></math></inline-formula> and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>0.9</mn></mrow></semantics></math></inline-formula> is optimal for noise reduction in the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mn>30</mn><mo>∘</mo></msup></semantics></math></inline-formula> configuration. …”
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    Kinetic Analysis of Molten Oxide Reduction Using Bottom-Blown Hydrogen Injection by Lijin Lu, Feng Wang, Haifeng Wang, Jian Qiu, Xiaodong Ping

    Published 2024-11-01
    “…The hydrogen utilization rate reached a maximum of 41.87%, then decreased continuously and finally maintained at about 20%. Using the method of model fitting, it was found that the hydrogen-based molten reduction conformed to the phase boundary reaction model (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>G</mi><mfenced separators="|"><mrow><mi>α</mi></mrow></mfenced><mo>=</mo><msup><mrow><mn>1</mn><mo>−</mo><mo>(</mo><mn>1</mn><mo>−</mo><mi>α</mi><mo>)</mo></mrow><mrow><mn>1</mn><mo>/</mo><mn>2</mn></mrow></msup></mrow></semantics></math></inline-formula>), the corresponding mechanism function is <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>f</mi><mfenced separators="|"><mrow><mi>α</mi></mrow></mfenced><mo>=</mo><msup><mrow><mn>2</mn><mo>(</mo><mn>1</mn><mo>−</mo><mi>α</mi><mo>)</mo></mrow><mrow><mn>1</mn><mo>/</mo><mn>2</mn></mrow></msup></mrow></semantics></math></inline-formula>, where α stands for the reduction conversion, and the reaction rate constant <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>k</mi><mo>(</mo><mi>T</mi><mo>)</mo></mrow></semantics></math></inline-formula> is 2.37 × 10<sup>−4</sup> s<sup>−1</sup> under the experimental conditions.…”
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