Yong Qian

Bio: Yong Qian is an academic researcher from Shanghai Jiao Tong University. The author has contributed to research in topics: Combustion & Ignition system. The author has an hindex of 24, co-authored 112 publications receiving 1988 citations. Previous affiliations of Yong Qian include Lund University.

Recent progress in the development of biofuel 2,5-dimethylfuran.

Abstract: 2,5-Dimethylfuran (DMF), which is considered as a promising new generation of alternative fuel, has the potential to relieve the global fossil fuel shortage and air pollution problems. In the last 5 years, the preparation methods, applications, and the oxidation and combustion characteristics of DMF have been studied extensively. Findings have shown that DMF could be produced from renewable biomass in large scale through converting cellulose. DMF has many desirable characteristics that overcome the drawbacks of low-carbon alcohols such as ethanol and n-butyl alcohol. It can be directly used in spark ignition (SI) engine or used after mixing with gasoline. When mixing with diesel, it can be used in compression ignition (CI) engine and the emission of soot can be cut dramatically. Although significant achievements have been achieved so far, some remaining problems need to be researched. Those problems include but are not limited to technologies for large-scale commercial applications of DMF, methods for increasing loads of the oil supply system, ways to reduce the NOx emission from using DMF, and the detailed combustion mechanism of DMF. Especially, how to reduce the emission of small particles when fueling SI engines with DFM should be given the priority.

The synthesis of a novel graphene-based inorganic–organic hybrid flame retardant and its application in epoxy resin

Abstract: In this paper, a novel graphene-based inorganic–organic hybrid flame retardant (GFR) was prepared via sol–gel reaction of FGO and phenyl-bis-(triethoxysilylpropyl) phosphamide (PBTP) and characterized by FT-IR, XPS, XRD, TGA and AFM. The influence of the GFR on the thermal stability and flame retardance of epoxy resin composites were characterized by TGA, LOI as well as micro-cone, which indicated that GFR brought a good effect in enhancing the residual char and flame retardance of epoxy composites. The dynamic mechanical properties and electrical properties of EP composites were also analyzed.

Review of the state-of-the-art of biogas combustion mechanisms and applications in internal combustion engines

Abstract: As a kind of renewable biofuel for use in internal combustion engines, biogas has been widely paid attention to recently. In this review, the researches on basic combustion characteristics and chemical kinetics of biogas are summarized, and its applications in internal combustion engines are also discussed. These studies show that the main challenge of the large-scale application of biogas is the instability of its components, which is due to differences in the production process and the raw material species. Detailed chemical kinetics and simplified chemical kinetic models for multiple components of biogas need to be validated. In engine applications, a certain proportion of H2 added to biogas can improve the combustion properties. The application of biogas in dual fuel mode is an attractive way to promote the efficient utilization of biogas. However, further studies on the efficiency and emissions of engines under variable conditions need to be analyzed in detail.

Theory of cross-correlation analysis of PIV images : Image analysis as measuring technique in flows

Abstract: To improve the performance of particle image velocimetry in measuring instantaneous velocity fields, direct cross-correlation of image fields can be used in place of auto-correlation methods of interrogation of double- or multiple-exposure recordings. With improved speed of photographic recording and increased resolution of video array detectors, cross-correlation methods of interrogation of successive single-exposure frames can be used to measure the separation of pairs of particle images between successive frames. By knowing the extent of image shifting used in a multiple-exposure and by a priori knowledge of the mean flow-field, the cross-correlation of different sized interrogation spots with known separation can be optimized in terms of spatial resolution, detection rate, accuracy and reliability.

How Catalysts and Experimental Conditions Determine the Selective Hydroconversion of Furfural and 5-Hydroxymethylfurfural.

Abstract: Furfural and 5-hydroxymethylfurfural stand out as bridges connecting biomass raw materials to the biorefinery industry. Their reductive transformations by hydroconversion are key routes toward a wide variety of chemicals and biofuels, and heterogeneous catalysis plays a central role in these reactions. The catalyst efficiency highly depends on the nature of metals, supports, and additives, on the catalyst preparation procedure, and obviously on reaction conditions to which catalyst and reactants are exposed: solvent, pressure, and temperature. The present review focuses on the roles played by the catalyst at the molecular level in the hydroconversion of furfural and 5-hydroxymethylfurfural in the gas or liquid phases, including catalytic hydrogen transfer routes and electro/photoreduction, into oxygenates or hydrocarbons (e.g., furfuryl alcohol, 2,5-bis(hydroxymethyl)furan, cyclopentanone, 1,5-pentanediol, 2-methylfuran, 2,5-dimethylfuran, furan, furfuryl ethers, etc.). The mechanism of adsorption of the ...

Nanoconfined phase change materials for thermal energy applications

Abstract: Phase change materials (PCMs) have been extensively characterized as constant temperature latent heat thermal energy storage (TES) materials. Nevertheless, the widespread utilization of PCMs is limited due to the flow of liquid PCMs during melting, phase separation, supercooling and low heat transfer rate. In order to overcome these inherent problems and to improve thermo-physical properties, the confinement of PCMs at the nanoscale has been identified as a versatile strategy, which ensures the encapsulation of PCMs in much smaller nano-containers. Such strategies including core–shell, longitudinal, interfacial and porous confinement have been widely presented in recent years to efficiently encapsulate PCMs in nanospaces and are presenting attractive ways to enhance thermal performance. This review summarizes the recent advancement and critical issues of nanoconfinement technologies of PCMs from the point of view of material design. In addition, the potential applications of nanoconfined PCMs in diverse fields, including energy conversion and storage, thermal rectification and temperature controlled drug delivery systems, are presented in detail. Finally, the major drawbacks associated with nanoconfined PCMs and their prospective solutions are also provided.