In this article, we prepared novel basalt fiber (BF)-reinforced polypropylene (PP) composites based on the synergistic reinforcement of cellulose nanocrystals (CNCs). First, we compared the enhancement effect of CNCs and silane coupling agent-modified BFs on PP, showing that the enhancement effect of the former was more significant. Subsequently, to further improve the mechanical properties of the composites, CNCs were introduced into the BF-reinforced PP composite system as the third phase, and the results suggested that their combination with BFs could synergistically strengthen the PP matrix composites. Simultaneously, the study also shows that when the mass percentage of CNCs and BFs are 1 and 30%, respectively, the composite achieves the highest mechanical strength, which is 64.31% higher than that of the PP matrix. The systematic characterization revealed the synergistic enhancement mechanism: on the one hand, CNCs not only promoted the improvement of PP crystallinity by heterogeneous nucleation but also formed a wedge-shaped structure between them and BFs through hydrogen bonding to prevent PP molecular movement; on the other hand, the BFs promote not only the extrusion crystallization of the resin matrix but also the network structure formed by the appropriate content of BFs can realize the rapid transmission of external stress.

Basalt fiber (BF) is a kind of high-performance fiber rising rapidly in recent years. BF is typically used in the field of structure engineering because of its high strength and high modulus. The preparation of BF-based composites first requires surface modification of BF to improve the interfacial bonding between BF and the resin matrix. With the continuous deepening of the research on BF surface modification, researchers have found that special surface modification can obtain BF-based functionalized composites, and this field has received extensive attention in recent years. In this article, research work on BF-based functional composites in recent years are summarized and reviewed from the aspects of electromagnetic shielding, water treatment, catalytic function and fire insulation. Finally, this article summarizes the BF surface modification methods, and proposes the development trends and direction of BF-based functional composites.

The rim seal is used to prevent the mainstream ingestion to the gap between the turbine vane and blade. In this research, the dolphin lip with a hook configuration and a large seal cavity with hook structures are designed based on the high-pressure turbine datum single shark lip rim seal configuration. Sealing effect and flow field parameters are measured by the experiment method, and numerical simulation is used to supplement the mechanism. For three configurations, the effect of leakage slot vortex on seal efficiency and the influence of leakage vortex generated by the interaction between purge flow and mainstream are discussed in depth.The results show that the dolphin lip with hook structure form a reverse vortex which contrary to the leakage slot vortex to increase the sealing efficiency, and the large seal cavity makes the sealing efficiency is higher than the datum structure. With different purge flow rates and unequal seal structures, purge flow produces three types of leakage vortexes in the passage. Besides, the seal configuration with dolphin lip will produce Kelvin-Helmholtz instability at the interface between the purge flow and mainstream at a lower purge flow rate, and thus induce new leakage vortex branches in the blade passage.