| 1 | Hybrid Slot-Groove Casing Treatment for Stall Margin Improvement on an Axial Flow Compressor with Circumferential Total Pressure Distortion显示文摘The hybrid slot-groove(S-G)casing treatment(CT),which combines the advantages of slot and groove in consideration of stall margin enhancing and efficiency penalty,was experimentally investigated under circumferential distorted inflows.Previous experiments showed that the hybrid S-G CT can extend the stability by 19.79%with uniform inflow condition.To further estimate its stability enhancement ability with distorted inflow,three types of circumferential total pressure distortion inflow that the distorted intensities(DC(60))are equal to 0.90%,4.12%,and 24.75%,are selected to conduct a serial of experiments.Results demonstrated that the stability of the compressor were deteriorated by 7.87%,9.19%and 39.08%respectively under three distorted inflows.It was founded that,under the above-mentioned distorted inflows,the hybrid S-G CT was able to extend the stability by 18.48%,17.81%,and 13.80%,respectively,which proved the strong anti-distortion ability of the hybrid S-G CT.By using the dynamic pressure sensors fixed on the casing wall,the unsteady measurements demonstrated that the stall precursor with uniform and circumferential distorted inflows are always spiky-wave;thus the hybrid S-G CT can play an excellent stability enhancement capability.The analytical results with power spectral density proved that,when at the same flow point,the perturbation,with frequency being around the rotating stall frequency band,was distinctly suppressed by hybrid S-G CT,thus delaying the rotating stall.The stall precursor detected in the casing wall depicted that unlike the short length-scale of stall precursor(5–6 blade passage)under smooth casing;the hybrid S-G CT can create a stall precursor with long length-scale.Under the distortion intensities from 0 to 4.12%,the length scale of the stall precursors occupies approximately 10–12 blade passages.As the distortion intensity further increases to 24.75%,the length scale of stall precursor increases to occupy 16–17 blade passages.This phenomenon can guide the stall warning studies with compressors using CT in the future. | LI Yihan LI Jichao YANG Chen DU Juan ZHANG Hongwu NIE Chaoqun | 2023 | Journal of Thermal Science2023，32，2： | 0 |
| 2 | Shape dependent protein-induced stabilization of gold nanoparticles:From a protein corona perspective Special Collection:Distinguished Australian Researchers显示文摘Gold nanoparticles(AuNPs)are promising materials for many bioapplications.However,upon contacting with biological media,AuNPs undergo changes.The interaction with proteins results in the so-called protein corona(PC)around AuNPs,leading to the new bioidentity and optical properties.Understanding the mechanisms of PC formation and its functions can help us to utilise its benefits and avoid its drawbacks.To date,most of the previous works aimed to understand the mechanisms governing PC formation and focused on the spherical nanoparticles,although non-spherical nanoparticles are designed for a wide range of applications in biosensing.In this work,we investigated the differences in PC formation on spherical and anisotropic AuNPs(nanostars in particular)from the joint experimental(extinction spectroscopy,zeta potential and surface-enhanced Raman scattering[SERS])and computational methods(the finite element method and molecular dynamics[MD]simulations).We discovered that protein does not fully cover the surface of anisotropic nanoparticles,leaving SERS hot-spots at the tips and high curvature edges‘available’for analyte binding(no SERS signal after pre-incubation with protein)while providing protein-induced stabilization(indicated by extinction spectroscopy)of the AuNPs by providing a protein layer around the particle’s core.The findings are confirmed from our MD simulations,the adsorption energy significantly decreases with the increased radius of curvature,so that tips(adsorption energy:2762.334 kJ/mol)would be the least preferential binding site compared to core(adsorption energy:11819.263 kJ/mol).These observations will help the development of new nanostructures with improved sensing and targeting ability. | Anastasiia Tukova Yihan Nie Mohammad Tavakkoli Yaraki Ngoc Thanh Tran Jiaqiu Wang Alison Rodger Yuantong Gu Yuling Wang | 2023 | Aggregate2023，4，4： | 0 |
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